Speedbor, 8 piece, pro spade drill bit set, includes 6" length bits with 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8" & 1-1/2" bits, all bits have a 1/4" hex shank that fits all drills & 1/4" quick change adapters, patented micro groove cutting edge & spurs produce a smoother hole finish, double spur design scribes the hole before the chips are made, producing a cleaner hole & reducing vibration, rugged storage case with rubber over mold for added impact resistance & sliding latch design provides added security.