Quick Change High Speed Steel Drill Bit Set With Hex Shank (5-Pieces) Sizes in the set include: 1/4 in., 5/16 in., 3/8 in., 7/16 in. and 1/2 in. Designed for use in hand held and impact drills 1/4 in. hex shank can be used in quick change impact drivers Killer force drills (KFD) have a heavy-duty 135 split point for self-centering and reducing thrust Black and gold drills are manufactured from premium grade high speed steel For use in wood and hard metals Black and gold surface treated for use in stainless steel and other hard metal drilling Length between the chucking slot on the shank to the end of the shank is standard 3/8 in. Sizes (in): 1/4, 5/16, 3/8, 7/16 & 1/2 hex shank drill bits For use in wood, metal, stainless and other hard metal drilling 1/4 in. hex shank designed for use in hand held and impact drills Drill America KFD Killer Force Drill Bits are manufactured from premium grade High-Speed Steel. Gold and black surface treated for use in stainless steel and other hard M2