Vehiclex hitch tightener is strong enough to eliminate wobble, rattle, noise, and hitch movement for cargo carriers, bike racks, hitch receivers, trailer ball mounts, etc. All components are made of carbon structural steel, which is usually used in construction and engineering welded structures, and also as mechanical fasteners. The diameter of Vehiclex steel U-bolt is 0.44″ (0.51″ with coating). And the width of the plate is 0.31″. We use more massive construction than other brands to ensure your confidence on the road. The rubber coating on the U-bolt and powder coating on the tightener plate reduce the risk of scratches and chipping, which resist corrosion in any weather. The anti-rattle stabilizer is compatible with 1 1/4″ and 2″ receivers.