These are the #2 square-recess driver bits supplied with all Kreg pocket-hole jigs, available separately to use as spares or to replace worn bits. The slim, round shanks fit easily in the counterbore of a pocket hole so you can drive screws without damaging the sidewalls. Each is 6" long and has a 1/4" hex shank that’s grooved for use in quick-change chucks. Sold in pairs. Made in USA.