The Reese Towpower Interlock Hitch Ball Wrench makes it simple to tighten hitch ball nuts. A long handle provides the leverage needed for torquing. Fits 1-1/8 and 1-1/2 hitch ball nuts. Use the wrench by itself or when tightening a Reese InterLock hitch ball to an interlock nut mount. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Towing Accessories.