Easy to Install - Quick installation in minutes and keep the cargo carrier wobble-free on a long haul. Simply slide the U-bolt onto the receiver, then slide the clamp plate into the bolt and tighten last. Fits Class I, II, III, or IV (1, 2, 3, or 4) hitches measuring both 1.25" and 2" hitches Most vehicles install the flagpole, trailer box, tail brackets may appear as a loose, wobbly, or shaking situation. Main Function - The hitch tightener helps prevent excess movement, annoying rattling, noise, wobbling of tow ball mounts, bike racks, hitch mounts, etc. Durable Material - Designed by carbon steel clamping plate, high strength nuts, washers and U-bolt, no rust. Durable, strong and stable holding. Heavy duty hitch tensioner anti-rattle stabilizer can solve these problems. It holds the hitch firmly and eliminates 90% of the rack wobble. It works great to eliminate the shaking, rattling and noise of the rack behind the van. Wide Usages - Suitable for a variety of towing with transport vehicles like truck, SUV, sedan, RV, van, camper and minivan. Can be used with standard ball hitch, concealed hitch, receiver hitch, hitch extender, hitch adapters, weight distribution hitch, front hitches and more. Yuemsh Material: Carbon steel + ABS + galvanized color: black + silver Package Contents: 1 x trailer hitch Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3 cm.Yeuri