Hitch tightener prevents rattling, wobbling, rocking and hitch movement for cargo carriers, hitch racks, bike racks and trailer ball mount brands such as Thule, Rola, Yakima, Inno, Draw-Tite, Hidden Hitch, Reese and StowAway Includes a heavy-duty stainless steel U-bolt and thick powder coated plate that will stand up to all weather conditions and loads. Easy installation by sliding the U-bolt over the stinger, sliding the tightener plate into the bolt, and tightening it in place with the included hardware, can be mounted from the bottom if hitch ground clearance is low Hitch tightener is compatible with all hitch brands, including Curt, Blue Ox, Hidden Hitch and U-Haul, among others, and hitch classes I, II, III, and IV (1, 2, 3 and 4), both 2" and 1.25" models, ideal for hitches on SUV's, vans, trucks, RV's, sedans and trailers. Original anti-rattle hitch tightener design is proven to be one of the strongest and most effective on the market Manufactured in the USA with a lifetime warranty