1.Our hitch tightener is equipped with heavy duty 0.4' Ubolt and 0.28' thick black powder coated plate antirattle stabilizer, which can withstand all weather conditions and is rust . 2.Reduce rattle and movement for hitch tray, cargo carrier, bike rack, trailer ball mount of brands like curt, highland, goplus, pro series, rola, yakima, thule, etc. It can help decrease noise and provide a quiet towing environment. 3.This tow clamp is perfect for locking 1.25' and 2' hitches, compatible with most hitches classes I, II, III, and IV (1, 2, 3 and 4). It is suitable for trailer trucks, SUVs, sedans, RVs, camper vans and minivans. 4.Easy to install. After inserting the tube, lock it directly with the Ubolt and plate. Put on the original spring washers, flat washers and fasten with nuts, then it's done. If the hitch is low and there is a risk of the UBolt scraping the ground, lock the tightener from the bottom.