1-3/8 '' x 6 '', Speedbor Max Drill Bit, capacity unit Length, Tri-Flute Design For Faster Chip Ejection, cut Spurs Have 3 cut Edges For Added Durability, ample Screw Tip Allows Bit To Self Feed, Grooved Hex Shank Slipping In Drill Chuck Or Bit Extension, Fits All capacity unit 1/4 '' Quick Change Chucks.