Easy-to-use Ultra-Tow Hitch Anti-Wobble Collar reduces the wobble and movement of your trailer hitch or accessories inside the receiver. Simply clamps to a 2in. hitch tube and secures in place. Great for use with Class III or Class IV hitches as well as bike racks, cargo carriers, ball mounts and more. Accessory Type Anti-wobble. Tough, all-steel construction Easy installation with simple clamp mount to a 2in. hitch tube Versatile unit handles a variety of accessories