ATI® TOOLS High Speed Steel...
High speed steel (HSS) drill bits are extremely hardwearing and particularly well designed for drilling into metal surfaces, as they are much more resistant to the heat generated from the fast speed operation. The front edges cut the material, whilst the spirals remove debris from the hole. ATI® TOOLS HSS made threaded shank drill bits feature a 135° split point and a 1/4"-28 threaded shank. They are offered in different drill sizes and lengths in inches. Please consult the supplied documentation.