High speed steel black and gold quick change hex shank drill bits are manufactured from premium grade high speed steel. These Killer Force Drills (KFD) have a heavy duty 135 degree split point for self-centering and reducing thrust. Gold and black surface treated for use in stainless steel and other hard metal drilling. 1/4" Hex Shank can be used in quick change impact drivers. The length between the chucking slot on the shank to the end of the shank is standard 3/8".