Sizes: 1/16" - 1/2" by 1/64" in a unique round Bit Cooler drill index combines form and function into one beautifully designed, easy to carry drill set.KFD Killer Force Drill Bits are manufactured from M2 premium grade high speed steelFor use in a wide range of materials such aluminum, iron and stainless steel135° split point tip for fast penetration and accurate drillingRound shank for use in a wide range of tool holding systems