KFD Killer Force Drill Bits are manufactured from M2 premium grade high speed steel, black and gold surface treated for use in a wide range of materials such aluminum, iron and stainless steel. They have a 135° split point tip for fast penetration and accurate drilling and a round shank for use in a wide range of tool holding systems. Reduced Shank Drills expand the size range capacity of a portable drill chuck. 3-Flat shank for an extra secure hold in your chuck.