6 Piece, Speedbor Max Set, Includes 1/2", 5/8", 3/4", 7/8", 1" & 1-1/4" Sizes, Standard Length Speedbor Max Spade Bits, Tri-Flute Design For Faster Chip Ejection, Cutting Spurs Have 3 Cutting Edges For Added Durability, Full Screw Tip Allows Bit To Self Feed, Grooved Hex Shank Prevents Slipping In Drill Chuck Or Bit Extension, Fits All Standard 1/4" Quick Change Chucks.