SECURE: Hitch tightener prevents rattling, wobbling, rocking and hitch movement for cargo carriers, hitch racks, bike racks and trailer ball mount such as , Rola, Yakima, , Draw-, Hidden Hitch, . INCLUDED: coated plate that will stand up to all weather conditions and loads. Easy installation by sliding the U-bolt over the , sliding the tightener plate onto the U bolt, and tightening it in place with the included corrosion resistant hardware. Can be mounted from the bottom if hitch ground clearance is low. COMPATIBILITY: Hitch tightener is compatible with all hitch , including Curt, , Hidden Hitch and , among others, and hitch classes I, II, III, and IV (1, 2, 3 and 4), both 2inch and 1.25inch models, perfect for hitches on SUV's, caravans, trucks, RV's, sedans and trailers. SUPERIOR DESIGN: Anti-rattle hitch tightener design is proven to of the strongest and most effective on the market. Applicable model: car trailer, truck, RV product function: it can prevent the goods transport vehicle, pylon, bicycle frame and trailer ball rack from rattling, shaking, rocking and other actions. Product type: Fastener Width: 60mm Length: 102mm outer diameter: 26 mm Colour: black Material: iron Package Contents: 1 * Trailer Fastener Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.