3 Piece, Speedbor Max Drill Bit Set, Includes: 5/8", 3/4" & 1", Standard Length, 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.