M14x1.5 drain plug repair kit includes a special core drill for higher volume repairs no need to switch back from the drill to a counerbore because the counterbore is built in the the 4 flute coredrill only 3" inches or 76mm in length for max clearance. Also includes tap, tap guide, install driver tool, seat reconditioner, sealer, and 10 inserts p/n 14155 Time-Sert Made In USA