This Jendyk Replacement Rib Nut replaces Jendyk model#s XLT20B and XLT66B. This nut can remove left-hand and right-hand threaded inner cap nuts. Easily drive the non-beveled open end of the rib nut by hammering the drive-on tool (not included) and remove the damaged nut with a lug or impact wrench. This replacement nut is made in the U.S.A. of proprietary heat treated alloy steel with extended longevity.