Different pins, rivet pins & collars used on Textron Aviation Cessna, Beechcraft and Hawker aircraft. Also available are alternative respective parts from other manufacturers. HI-SHEAR HI-LOK™ pins and collars are catalogued as TEXTRON AVIATION part numbers but the alternative HI SHEAR part number is also included in the product reference number (SKU). When fasteners are sold in packs the specified number of pieces per pack is designated after the letters "PK" in the product SKU.

Avdel® is part of STANLEY® Engineered Fastening, offering a wide range of structural and non-structural blind rivets, speed blind rivet fasteners, lockbolts, and tooling systems.

Avdel® blind rivets are made of steel, plastic or other materials with different strengths and material thicknesses.They are ideal for situations where access to the connecting materials is only possible from one side, and used in all manufacturing industries worldwide for almost every assembly task to ensure a secure hold.

Avdel® structural rivets are made for the highest demands due to their high resistance against shear and tensile forces and come in different product lines including Avibulb® XT, Avinox® XT, Hemlok®, Monobolt®, Interlock®, Q-Rivet®, and Klamp-Tite® Structural.

Avdel® non-tructural rivets are used on assemblies without high requirements regarding resistance against shear and tensile force. Like their structural counterparts they come in different models including Avex®, Stavex®, Avinox®, Avibulb®, Bulbex®, T-Lok®, Avdelmate®, and Klamp-Tite® Non-Structural.

Avdel® Avdel Speed Blind Fasteners are designed for fast and reliable fastening of metals, plastics, composites, and passive electronic components in mid- and high-volume application. Available in a broad choice of materials, finishes, lengths, and diameters, they have been originally designed for the aerospace industry, but now on assembly applications for household goods, lighting, electronic sub-assemblies, light metal fabrication and automotive. Speed blind fastener solutions include Briv®, Chobert®, NeoSpeed®, Rivscrew®, Avsert®, Avtronic®, Avlug®, Grovit®, and Double Flush Chobert®.

Avdel® Lockbolts are two-piece fasteners designed for high-strength and secure assemblies.Quick and easy to use, they provide protection against unwanted loosening and are the ideal when a welding or a screw-nut connection is not not possible, practicable, or too time consuming. Frequently used in commercial vehicles, railway, construction, solar field construction and container manufacturing. Avdel® lockbolts offer perfect resistance to vibration and material fatigue due to the swaged lock which forms collar material permanently into the circular grooves of the bolt. Respective product lines include NeoBolt®, Avdelok®, Avdelok® XT, Maxlok®, Avtainer®, and Avbolt®.

Avdel® Blind Rivet Nuts provide a fast, reliable and cost effective system for the introduction of high-quality, load-bearing threads. They offer many advantages against weld nuts, thread forming screws, press nuts and screw / nut combinations. Product range includes Eurosert®, Nutsert®. Hexsert®/Euro Hexsert®, High Strength Hexsert®, Squaresert®, Versa-Nut®, Jack-Nut®, and Well-Nut®.

In addition to fasteners Avdel® offers a range of powerful and lightweight manual hand tools, hand-held hydraulic tools, hydro-pneumatic tools, battery powered hand tools for processing blind rivets, speed rivets, blind rivet nuts and lockbolts.

POP® PRG510A/MCS510A series air rivet guns are strong, compact, and trouble-free pneumatic tools ideal for continuous high-production riveting. Αvailable with either a deflector (PRG) or with a Mandrel Collection System (MCS). The PRG-511 A offers an extended nose housing for improved access. Sets aluminum in sizes 3/32″ – 3/16″ in open-end and closed-end POP rivets.

HOWMET® AEROSPACE Inc. (formerly ARCONIC Inc.) develops and manufactures high performance, engineered products and solutions for the aerospace, industrial gas turbine, commercial transportation and oil and gas markets. HOWMET® FASTENING SYSTEMS product range under different brands offers the greatest breadth and depth of fastening solutions available including self-locking nuts, quick-release fasteners, draw latches, threaded inserts, lock-bolts, and structural blind fasteners.

HOWMET FASTENING SYSTEMS structural blind fasteners and lockbolts (including those under HUCK® brand) are designed to provide permanent, vibration-resistant, superior-quality joining solutions for use in aerospace and industrial applications. Suited for applications where the joints are integral to the structure, they offer high tensile, shear & clamp properties.  For additional information please refer to the Product Description section and the supplied documentation. Installation tool systems (separately listed) are also offered.

The MS21141 Series of blind fasteners are high srength pull type protruding head blind bolts (or otherwise termed as rivets) made of corrosion resisting steel (typically A286 stainless steel) with a 95 KSI shear strength. As structural rivets(*) they are intended for use on load-bearing applications, offering greater shear and pull-out strength, and vibration resistance. These fasteners are produced by different manufacturers and sold uder their respective brands and part numbers. Indicative examples include PCC CHERRY AEROSPACE CR7621 Series of Maxibolt® Blind Bolts or  HOWMET AEROSPACE Unimatic® UBP-EU Blind Bolt Fasteners. Offered in different nominal diameter sizes & corresponding grip ranges in inches, passivated or cadmium plated and with or without lubrication. They can be installed with the use of single action tools and they are supplied either as OEM part numbers of their respective manufacturer or MS21141 Standard part numbers under our own branded (AVIATIONEU NEW ERA) product lines. In the case of OEM parts, these are listed separately. Sold in pieces or packs where the specified number of fasteners per pack is indicated after the letters "PK" in the product reference number (SKU). 

Depending on the selected size & stock conditions alternate part numbers of the same fastener may be supplied in lieu of the ordered, meeting or exceeding Standard specifications. 

For more information please refer to the attached documentation or contact us.

(*) Other structural and non-structural blind rivets are also offered for a wide range of applications. Please refer to their separate listings.

Countersinking is used to ensure that flat head screws or fasteners sit flush against the workpiece. Countersinks used in aerospace and industrial applications are made of durable materials such as High Speed Steel (HSS) known for its hardness, toughness, and ability to withstand high temperatures. High Speed Steel (HSS) countersinks are well suited for cutting aluminum sheet metals. When combined with Cobalt, an alloying agent in steels to improve the hardenability, strength, and wear resistance in machining applications but also due to its ability to resist wear at higher temperatures, the  respective countersinks are often used for cutting stainless steel and other aluminum alloys.

Sourced from quality suppliers, integral (fixed) pilot Microstop countersink cutters are offered as part of our own labeled (AVIATIONEU NEW ERA) product lines. Made from HSS or HSS Steel with Cobalt, they consist ideal tools for aircraft manufacturers, aircraft maintenance/ repair stations or  industrial manufacturers for precise and accurate countersinking, cost-effective alternatives to other OEM products and and stocked by our suppliers for fast deliveries. 

Offered in different flutes, body and pilot diameters and sold  either separately (*) or in custom sets to address specific customer needs in machining applications.

Because of the difference in composition between HSS and Cobalt, main strengths of HSS countersinks are their high hardness and wear resistance. Therefore, as a general rule, they consist a better choice when you want your countersinks to retain their strength even when exposed to extreme wear or abuse. For higher hardenability, strength, and wear resistance and in applications when when countersinks are to be exposed to extremely high temperatures, cobalt countersinks should best be used.

AVIATIONEU NEW ERA countersinks can be used with popular adjustable or Microstop countersinking units utilizing a threaded shank drive (sold separately). For additional information please consult the supplied documentation or contact us.

(*) Minimum Order Quantities apply depending on the selected countersinks or their sets.

Countersinking is used to ensure that flat head screws or fasteners sit flush against the workpiece. JITTERBUG Pilot Countersink Cutters can be used with flush rivets in different countersinking applications. They consist cost effective alternatives to other brands. They are available separately or in convenient sets of different pilot diameters. Offered sets include 6 pieces (1/4 5/16 3/16 5/32 3/32 1/8 in.) or 4 pieces (3/16 5/32 3/32 1/8 in.) per set. For additional information please consult the supplied documentation or contact us.

AICRAFT TOOL SUPPLY (ATS) is a manufacturer of tools and hardware for the aviation industry. ATS offers an extensive range of aircraft countersink cutters and piloted aircraft stop countersink cutters (aka Micro-Stop cutters or Microstop Countersinks) used to make precision countersinks to accept flush-head fasteners.

Our offered ATS countersinks include:

HSS 1/4-28 male threaded 3 cutting flute pilot cutters,

HSS 1/4-28 male threaded, 1/2” diameter zero flute pilot cutters,

HSS 1/4-28 male threaded removable pilot cutters with solid carbide tip (require 1500P pilot),

Hollow cutters designed to cut away swagged or threaded collars from fasteners,

Respective offered ATS Microstops include:

133-HD heavy duty Microstop Countersink with ball bearings for ultra smooth operation. The ball bearing design also makes it run much cooler than a standard microstop,

133-Mini Microstop Countersink for use  in tight areas that can’t be reached by a standard cage. 

133-Slim Microstop Countersink packing all the features of a standard microstop in a slim design of only 11/16” in diameter. 

 Complete kit is a great package deal featuring our 133

133 Microstop Countersink Kit which includes the Microstop and 4 pilot cutters (1000-100 series) in sizes #40, #30, #21, and #12. The kit is also offered with the countersink only.

For additional information please consult the supplied documentation or contact us.

ATS Pro-X rivet guns offer unmatched controllability when setting rivets of any type or size. They are used in aircraft manufacturing plants such as Boeing and Lockheed-Martin. With the improved variable power control, proper riveting can be accomplished with confidence.  Different models serve specification requirements (see attached table). 1/8" Aluminum (3/32" Steel) Rivet Capacity. These guns accept all .401 shank rivet sets and attachments. Non-slip Powder Coat Finish. 1/4" NPT Inlet. Lifetime ATS-Pro Warranty.

ATI® TOOLS 107A series flush straight drive rivets are manufactured from S2 high-grade shock-resistant steel and machined in accordance with MIL-STD GGG-R-425. Large radii at critical points enable these rivets to withstand continuous rugged use.They are slightly crowned with a highly polished face designed for rapid flush riveting where a smooth skin surface is essential and feature large radii at critical points to prevent breakage, protection with plastic coating to prevent damage during shipment and storage, blended radius between cup and chamfer with no sharp edges, which coin or mar skin, highly polished precision cup, free of machine marks and ridges and chamfered corners. Shank diameter 0.401".  Different sizes are available serve specification requirements for face diameters and lengths.

The CHERRY® Nut-Plate family of fasteners offers an extensive range of head styles in a low cost, pull through style rivet. Rivet heads include the CCR/CCMR274, “Universal”, CCR/CCMR264, 100° Flush, and the CCR/CCMR244, 100° Reduced Flush head (NAS 1097). Sleeve materials include C1018 steel or A-286 CRES stainless steel. Single action installation tools are all that is required to complete this low cost fastening system. Recommended installation tools include the G29 hand tool, which is sold complete with pulling head, or the G902/G902-15 lightweight power tool with pulling heads sold separately.

For additional information please refer to the supplied documentation or contact us.

JIFFY® AIR TOOL is a market leading solutions provider specializing in professional grade hand held, limited access, pneumatic drilling and fastener installation tools for the aerospace and aircraft industries. Manufactured in the USA, their product portfolio includes an extensive line of specialty hand-held pneumatic tools designed and built for easy, trouble-free operation and reach into difficult areas. Their tools are widely used by airframe assembly, maintenance, repair and overhaul facilities.

Modular Drill Motors & Attachments (JMD)

JIFFY® AIR TOOL pioneered the “Modular Tool” platform for drill motors and attachments (JMD). JIFFY® motors can accept a wide variety of drill attachments to meet limited access requirements.JIFFY® Pistol Grip Straight style drilling tools are offered in models with forward running, reverse running and reversible functions, safety trigger option, 250 – 20,000 RPM, and 0.3 – 1.5 HP.  Available Thread Sizes: 1/4-28, 10-32, 9/32-40, 5/16-24, 3/8-24 and 7mm Collet.

Modular Fastener Installation Tools (JMI)

With JIFFY® modular fastener installation platform installation motors can accept a wide variety of install attachments to meet limited access requirements. The latter are available in 17° indexable or fixed, 20° indexable or fixed, “L”, and straight install type offered in various series correlating to the torque capacity of the fastener. Their versatility is further enhanced by the three offered drive styles: a socket and key system,a flush gear with a key and a hex through with no key control to allow access to confined space installations.

In addition to the modular installation tools, ratchet install tools in straight, 17° and 20° head styles are also available. Their pneumatic ratchet wrenches can be used for HI-SHEAR fastener (*) installation quickly, easily, and efficiently. Their new & improved spring loaded hex tip holder allows the use of special hex tips that will hold the HI-LOK™ style fastener in place when installing non-interference fasteners. With the new & improved design, hex tips are easier than ever to change and can literally be changed in just a few seconds.JIFFY®  sockets and hex tips (sold separately) can be used with these wrenches.

For additional information please refer to the supplied documentation or contact us.

 (*) HI-SHEAR CORPORATION Fastening System includes HI-LITE™, HI-LOK™ and HI-LOK™/HI-TIGUE™ pin and collar fastener combinations. The HI-LOK™ fasteners are the second most used fasteners in aircraft structural assembly after the solid rivets MS20470 and MS20426. The HI-LOK™ fastener system includes a rivet pin (similar to a screw but with additional advantages) and a collar (similar to a nut). Pneumatic installation/removal tools for HI-LOK™ or HI-LOK™ style fasteners are also offered by  HS Tooling and U.S Air Tool Co. (USATCO). Please refer to the respective product presentations.

HI-SHEAR Fasteners are patented fasteners of HI-SHEAR CORPORATION (Patent Holder), subsidiary of LISI AEROSPACE, a manufacturer of advanced aerospace fasteners and installation equipment used in space, military and commercial vehicles. Depending on the fastener, they are made by quality fastener manufacturers (licensees) in different  countries including but not limited to LISI AEROSPACE companies, HOWMET ALCOA / SIMMONDS / FAIRCHILD, PCC  SPS, and others. 

HI-SHEAR nuts and collars are designed to fit with their related HI-LOK™/HI-TIGUE™ and HI-LITE™ pins  (separately presented) forming the respective fastener system. HI-LOK™ nuts and collars are designed to fit HI-LOK™ & HI-TIGUE™ pins. HI-LITE™ nuts and collars are designed to fit HI-LITE™, PULL-IN™, PULL-STEM™ & TAPER HI-LITE™ pins.

With a wide range of shapes, materials and coatings, they are suited for most of structural assemblies and are commonly used in the aerospace industry in tension and shear applications. Collars’ wrenching element is designed to break-away at a controlled preload. It has been tested over time and has proven its reliability when installed with non-torque-controlled tools. Main features of nuts and collars include:

- controlled preload

- wide variety of materials and coatings for installation in all structures

- suitable for shear or tension applications, with captive washer, self-aligning or self-sealing options

- limited access installation, using conventional tooling

- designed with a counterbore to fit nominal and oversized pins

- nuts allow customized torque and preload & low height design for low access areas

Please refer to the supplied documentation for additional information.

Gauges (also termed as gages) and gauge scales are widely used for inspection or measurement of correct grip length of  rivet pins, shear lockbolts, structural screws and bolts in aerospave and industrial applications. They ensure correct fastener selection, enhancing structural integrity, simplify the measurement process saving time during assembly, and improve accuracy in maintenance and repair tasks. Made from durable materials for long-lasting use (including high-strength alloys and stainless steel) they come with easy-to-read markings for quick and precise measurement.

Protrusion grip gauges & their assemblies (including apart from the grip gauge a grip gauge slide) can be supplied for use on HI-SHEAR Hi-Lilte®/Hi-Lok®/Hi-Tigue® Series of fasteners or those from PCC CHERRY AEROSPACE. 

These gauges are offered as sets of blades with different color markings for different nominal diameter sizes in Inch or Metric (mm) systems with the letter "M"in their part number denoting a Metric version. For example, those with 2-1522 part number, include five stainless steel blades (5/32", 3/16", 1/4", 5/16", and 3/8") on a keychain for portability, and can be used  with HI-SHEAR Hi-Lok®/ Hi-Tigue® fasteners ensuring proper pin protrusion for safe aviation fastener applications.Their counterparts, 2-1522HST are suitable for HI-SHEAR Hi-Lilte® fasteners. 

Grip Gauge Scales with or without a slide are also offered with measurement graduations in inches or inches and millimeters. The 269C3 Grip Gauge Scale from PCC CHERRY AEROSPACE, made of high-strength alloy, has been designed for precise grip measurement in various materials in aircraft structures. Can be used with CherryMax® & CherryLok® rivets. Its durable construction ensures long-lasting use, while its clear markings for quick reference, and user-friendly design for easy insertion into prepared holes for reliable readings, simplify the measurement process.

Depending on the selected part & stock conditions, grip gauges & scales for HI-SHEAR and PCC CHERRY AEROSPACE fasteners can be supplied as OEM parts or equivalent parts from other suppliers, such as OMEGA TECHNOLOGIES (separately listed) meeting or exceeding specifications. 

Economy models of gauges for shop rivet heads and rivet lengths are also available from ATS and AVERY TOOLS and can be used for measuring both universal head and flush rivets. Rivet head gauges are offered as a set of four gauges for -3, -4, -5, & -6 rivet sizes permanently stamped on each gauge. Each gauge measures MINIMUM height and MINIMUM diameter of shop heads AFTER setting eliminating guessing if the rivets are properly set, and are color coded with anodized finish. Their respective rivet length gauges measure -3, -4, -5 & -6 rivets and have been designed for checking the length of rivets BEFORE setting. Their set of rivet head gauges and the length gauges can be ordered as kits or separately.

For more information please contact us.

HI-SHEAR Fasteners are patented fasteners of HI-SHEAR CORPORATION (Patent Holder), subsidiary of LISI AEROSPACE, a manufacturer of advanced aerospace fasteners and installation equipment used in space, military and commercial vehicles. Depending on the fastener, they are made by quality fastener manufacturers (licensees) in different  countries including but not limited to LISI AEROSPACE companies, HOWMET ALCOA / SIMMONDS / FAIRCHILD, PCC  SPS, and others. 

The HI-SHEAR rivet pin range offers a versatile solution for most of structural assemblies. They consist a very common type of threaded fastener used for clearance, transition and low interference fit throughout the airframe (metallic and composite), from wings to fuselage, in engine fairings, and more. Easily installed from one side, by one person with conventional tooling.

HI-SHEAR rivet pin product portfolio includes the original HI-LOK™ (HL™) system, the latest HI-LITE™ (HST™) pins with an improved recess and HI-TIGUE™ (HLT™) pins with improved fatigue benefits. They can be used in shear and/or tension applications on plain or sloped surfaces and feature controlled preload, a wide range of sizes and variety of materials and coatings for installation in all structures.

Most fasteners are mainly loaded in shear. That should be the only way for rivets as their tension capability is relatively low. Whenever there is a substantial tension load in a fastener, a threaded bolt should be used.

Additional information is available in Product Description section and the supplied documentation.

RAPCO produces quality FAA-PMA approved replacement organic and metallic brake linings for Cleveland and McCauley brake assemblies on most general aviation aircraft. Organic linings are actually made from a semi metallic mix. RAPCO combines brass, copper and Kevlar fibers with a high temperature binding compound to provide outstanding performance and long service life. Most RAPCO organic linings have a built in wear indicator, which reduces the risk of damage to the brake disc and helps to optimize lining life. RAPCO organic linings are available in boxes of 10 or in organic lining kits containing the proper number of linings and rivets necessary for replacement on Cleveland or McCauley brake assemblies. They are convenient to have on hand when the need for relining occurs. Metallic lining replacements for the Cleveland brake assemblies are made of sintered steel, a specially developed process that fuses metallic particles to a steel carrier plate. RAPCO metallic linings offer long life and excellent braking performance.

RAPCO Brake Rivets are FAA-PMA approved quality tubular rivets produced from plated steel for mounting aircraft brake linings. The RAPCO RA825 Rivet Tool Kit is recommended for proper installation.

Please refer to the attached Application Guide for additional information.

AIRPRO INDUSTRY CORP. manufactures professional quality air tools, hand  & auto repair tools and accessories for professional applications under  the brand name AIRPROWU. AIRPROWU extensive product line ranges from aircraft tools to industrial, automotive/motorcycle ,tooling/molding, construction and auto body shop solutions and solutions for electronic assembly lines. AIRPROWU product line of Hydraulic Riveters include pneumatic, industrial hydraulic, air hydraulic riveter tools and others. Please refer to the specifications of individual riveters.

TRIMAS Corporation manufactures a diverse set of products primarily for the consumer products, aerospace and defense, and industrial end markets through TRIMAS Packaging, Aerospace and Specialty Products groups. 

ALLFAST FASTENING SYSTEMS® & MONOGRAM AEROSPACE FASTENERS® are parts of TRIMAS AEROSPACE™. ALLFAST is emerging as a world leader in blind rivet design, manufacture and delivery including Allmax/Supermax line, NAS1919/1921, A Codes, AB Codes and others. 

MONOGRAM serves the world’s markets with industry leading products including specialty fasteners, temporary fasteners for fixturing and alignment, fastener installation tools, finishing and removal tools and the design of innovative fastening solutions for the aerospace industry. Their product portfolio includes Visu-Lok® family of high strength fasteners available to 112 KSI shear, designed for use in metal structures, Composi-Lok® fasteners, industry's standard for blind fastening of composite laminates but equally well-suited to metal structures, Radial-Lok® unique hole-filling, high strength blind fasteners, and OSI-Bolt®, the only blind bolts capable of equivalent usage with solid shank bolts offering a full 1.5D bearing area. Intended as direct replacement for solid shank pin-and-collar systems.

For additional information please refer to the Product Description section and the supplied documentation.

MBC® Blind Fastening System by CHERRY® AEROSPACE is one of the industry’s simplest and most versatile riveting systems available today. These fasteners are offered as standard MBC® mechanically locked spindle rivets, simple, two-piece assemblies comprised of a MBC® rivet sleeve and a stem with an integral locking feature and as MBC® Lock Creator rivets (MBC®-L/C), same as the standard MBC® rivets with the addition of a lock creator anvil. This additional component simplifies installation of the fastener by allowing a single nose tip for installing the three available diameters, as in the CherryMAX® type rivets. Whether standard MBC® or MBC®-L/C rivets are used, each rivet comes complete as a single-piece assembly, ready for installation. 

MBC® Blind Rivets are offered  in diferent head styles (flush, reduced flush or protruding), aluminum and CRES (stainless steel) materials, different finishes, in 1/8" (3.2mm), 5/32" (4.0mm) and 3/16" (4.8mm) diameters, and various grip ranges.

They come in different series, such as the 4801-0xxx or 4804-0xxx for Standard MBC® aluminum rivets and conform to AIA NAS 1719, 1720, 1721, AIRBUS ASNA0080 or other Standards. They can be supplied as CHERRY® AEROSPACE OEM parts, parts under NAS, ASNA or other Standard part numbering systems, or equivalent parts from other manufacturers such as STANLEY Avdel (separately listed). 

The part number provides important information on  the rivet's attributes while, whenever available, cross-reference tables of part numbers of respecttive manufacturers with those of respective AIA NAS or other standards are also included in the product presentations.

A typical part number format for these rivets includes Blind Rivet Basic Part Number, indicating also its head style, a Material Letter Code, a number for rivet Nominal Diameter, a number for its Grip Size, and a Finish Letter Code.

Common numbers and letter codes as follows:

Dash after the Basic Part Number (-)indicates a Standard rivet while "L" indicates Lock Creator, 

Material Codes: H - for high-strength Aluminum Alloy , C - for Corrosion-Resistant Steel (CRES, Stainless Steel),

Rivet Diameter Sizes: -4 (.125″), -5 (.156″) -6 (.188″), corresponding to the nominal shank diameter in 1/32nds of an inch, 

Grip Sizes: allowable grip length range correlated with respective Grip Numbers included in the supplied documentation,

Finish Codes: A Clear Anodize per SAE AMS-A-8625, F Chemical Film per SAE AMS-C-5541, Passivation per AMS 2700, W Cadmium Plate AMS QQ-P-416, N Natural Finish.

MBC® Blind Rivets are sold in pieces but also in packs where the specified number of rivets per pack is indicated after the letters "PK" in the product reference number (SKU). Appearing prices are always for the units of measurement used each time. Depending on stock availability, alternative parts of equivalent Standards & sizes may be supplied in lieu of the ordered.

ATI® TOOLS 105A series AN470/MS20470 universal-head cup shaped double offset drive rivets are manufactured from S2 high-grade shock-resistant steel and machined in accordance with MIL-STD GGG-R-425. They feature protection with plastic coating to prevent damage during shipment and storage, blended radius between cup and chamfer with no sharp edges, which coin or mar skin, highly polished precision cup, free of machine marks and ridges and chamfered corners. Rivet Type: AN470/MS20470 universal-head. Shank diameter 0.401".  Available in different rivet sizes, body diameters and lengths in inches.