KFD Killer Force Drill Bits are manufactured from M2 premium grade high speed steel. For use in a wide range of materials in the iron and steel families such aluminum, iron, stainless steel and other hard metal drilling. KFD Killer Force Drill Bits have a 135 degree split point tip for self-centering and reducing thrust. Compared to a conventional 118 degree tip, these drills wont go "walking" on you. KFD Killer Force Drill Bits are black and gold surface treated for use in stainless steel and other hard metal drilling. Reduced Shank Drills expand the size range capacity of a portable drill chuck. Common flute and overall length for minimal adjustment during tool changes Drill Bit Set comes in Metal Case. All drill bits have a 1/2" Reduced Shank. Sizes include 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16" and 1"