Access Hitch Accessories 4000263 The anti-rattle clamp prevents your ball mount or hitch mounted accessory from rattling and shifting in the receiver. Constructed of aluminum with zinc plated hardware and fits 2 in. ball mounts or hitch mounted accessories. ROCKSTAR" Anti-Rattle Clamp ROCKSTAR" Anti-Rattle Clamp; Access Rockstar Anti-Rattle Clamp