Wheel hub stud bolt (also wheel bolts) thread restoration kit. The kit includes three basic sizes: M12x1.25. M12x1.50 and M14x1.50. The thread cutters have a special tooth profile. which can restore damaged or worn threads. Thanks to the special 1/2” head chuck, the cutter can be turned with either a half-inch T-handle or a clutch handle (“ratchet” or “snag”). The cutters can be ordered separately later if necessary.