Size :- Diameter 1/16" Ground Flute, High speed steel, steam tempered, blue finish, 118ยบ point Manufactured to BS328, DIN 338 and ISO235/1 These Drill Bits are suitable for drilling a wide range of materials such as mid hardness steels, mid hardness alloy steels, plastics, wood and many other similar materials. The ground flute design of these drills enable greater cutting ability and overall hole size accuracy AllTrade Direct also sell Cobalt Drill Bits suitable for drilling harder materials To assist the drilling process we recommend that you used drilling and tapping spray, available from the AllTrade Direct shop. Please click the above link for details