Craftsman Speed-Lok 16 Piece Drill and Drive Set 64316 Black oxide finish provides a corrosion resistant coating 135 degree split point penetrates on contact preventing drill bit "walking" (7/64-in and larger) 2-in-1 connector automatically locks in Speed-Shank tools plus 1-inch insert bits Seven Black Oxide Hex Shank Drill Bits: 1 each: 1/16", 5/64", 3/32", 7/64", 1/8", 5/32", 3/16" 1/4" Speed-Shank makes bit changes fast and prevents tool for slipping in drill chuck