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). Suitable for trailer truck SUV sedan RV camper van and minivan. Easy to install, after inserting the tube, lock them directly with a U-bolt and plate, put on original spring washers, and flat washers, and fasten by nuts, then done. Reduce rattle and movement for hitch trays, and cargo carriers, The anti-rattle hitch tightener design is proven to be one of the strongest and most effective and can help to decrease noise and give you a quiet world when towing. Perfect Fit: Adjustable fit and high-quality materials ensure a quiet, stable towing/transport experience. Ideal for trailer receivers, trailer racks, trailer anti-rattle devices, trailer anti-rattle pins, and more.