This screw machine drill bit is made of carbide and has a 12mm diameter shank. It is designed for use with all materials. This HY-PRO CARB series screw machine length drill bit has a WD1 finish, and has decimal inch, metric measurements. It is non-coolant through with a 102mm length. Plus it has one 55mm flutes, a right hand cutting direction, and 140 Degrees drill point.