About this item Hitch stabilizer constructed from heavy duty steel plate with U-Bolt, washer and nut with coat finish resist rust and corrosion Hitch clamp perfect for a variety of trailers, racks and carriers, including car, boat, motorcycle, cargo, luggage, dirt bike, ATV, wheelchair, cargo basket Hitch silencer was designed to completely eliminate hitch noise, wobble, rattle and hitch movement for cargo carriers, hitch receiver, trailer ball mounts, bike racks, hitch racks, etc. Enjoy your quiet towing experience Trailer hitch tightener easily installs with Class I, II, III or IV (1, 2, 3 or 4) hitches that measure either 1.25" and 2" (will not work on hitches larger than 2.5 Inches) Easy Installation,simply slip the U-bolt over the receiver, slide the tightener plate into the bolt, and tighten into place with the included hardware