TOPTOW is a well experienced manufacturer of towing accessories. We only craft products with the best quality. Toptow's Anti-Rattling Hitch Tightener is designed to eliminate hitch wobbling or rattling noise, and reduce the hitch movement for bike racks, hitch racks, cargo carriers, etc. This Anit-Rattling plate has applied black anodizing with better corrosion resistance, higher durability. U bolt has Zinc Nickle plating for long lasting, and reduce wear and tear. This package comes with:one aluminum plate, one U bolt, two plaint washers, two spring washers. It can be used on 1.25 inches x 1.25 inches or 2 inches x 2 inches receiving hitch and also fast and easy to install.