1.Most of the vehicles install the flagpole, trailer box, racks from the tail may appear the situation like loose, wobbling or shaking. 2.This heavy duty hitch tightener anti-rattle stabilizer can solve these problems. It hold the hitch tightly and eliminates 90% of the wobble of the rack. great to remove the wiggling, banging and clanging of the rack behind the van. 3.Main function - The hitch tightener helps to prevent the excess movement, annoying rattle, noise, wobble for tow trailer ball mounts, bike racks, hitch racks, etc Durable material - Designed by carbon steel tightener plate, high-strength nuts, and U-bolt, rust-free. Durable, strong and steady holding. 4. Easy to install - Quick install in minutes and keep the carrier -free on long drive. Simply the U-bolt over the receiver, then slide the tightener plate into the bolt, and last tighten into place. Suitable for Class I, II, III or IV (1, 2, 3 or 4) hitches that measure both 1.25 inch and 2 inch hitches 5.Wide uses - Fit for a of tow with carry vehicles like truck, SUV, sedan, RV, van, and minivan. Can be used with standard ball tow hitch, hitch, drop hitch, hitch extender, hitch adapters, weight distribution hitch, front hitches and more. Material: Carbon steel+ABS+galvanized colour:Black+silver Package Contents: 1 x 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.