This Jendyk Cap Nut and Lug Stud Removal Kit is designed for quickly and easily removing damaged inner cap nuts and lug studs on heavy-duty trucks and trailers. With this 1 kit you can remove 1 1/8in. dia./13/16in. square head nuts and 3/4in. and 5/8in. lug studs. Simply drive the non-beveled open end of the rib nut on by hammering the drive-on tool and remove the damaged stud/nut with a lug or impact wrench. Rib nuts and tool are made in U.S.A. from proprietary heat treated alloy steel with an extended life.