2.5mm Diameter Screw Machine Stub Length Carbide Drill, 135? Split Point, Bright Finish, 21mm Flute, 45mm OAL 21mm Flute Length,2.5mm Shank,46mm OAL GWS/Monster stub drills also known as screw machine or shorty drills are made from C-2 Sub-Micron Grain Carbide With 10% Cobalt Content. A relaxed 15? helix is designed for slower feed rates found on the most demanding jobs. 135? split point possesses the strength to pierce the hardest materials. One of the few drill designs capable for use on all six ISO material categories. Optional TiN & AlTiN coating can increase feed rates by 40%. Made in the USA. GWS/Monster Tool Part #460-400984