This Jendyk Inner Cap Nut Remover is designed for quickly and easily removing all damaged inner cap nuts with a 1 1/8in.dia./13/16in. square head. It is ideal for heavy-duty trucks and trailers. Simply drive on the non-beveled open end of the inner cap nut remover with a hammer and remove with a lug or impact wrench. This tool removes right-hand and left-hand threaded inner cap nuts and can be used over and over when care is given to drive the tool on the damaged inner nut as squarely as possible. Made in U.S.A. from proprietary heat-treated alloy with an extended life.