This general purpose jobber drill bit set is made of high speed steel. It includes a metal drill index, sizes #61, #62, #63, #64, #65, #66, #67, #68, #69, #70, #71, #72, #73, #74, #75, #76, #77, #78, #79, #80, is designed for use with all materials, and meets ASME standards. This jobber length drill bit set has a TiN finish, and has wire measurements. It is non-coolant through. Plus it has 20 spiral flutes, a straight shank, and 118 Degrees conventional point.