How Rock Tamers work ROCK TAMERSTM are the premiere heavy-duty adjustable mudflap system designed to provide the ultimate protection for all your towables.This patented system is easy to attach or remove from any standard 2″(5cm) ball mount. The overall width is adjustable and easily fine-tuned to fit any full size or dually truck. The mudflap height is adjustable to maintain consistent ground clearance when towing various loads. ROCK TAMERS™ are made of top quality materials and components.The Rock Tamer consists of a 25mm matt black powder coated UV protected finish, forged alluminium hub and arms with stainless steel support rods with zinc coating inside the rods and full length black rubber flaps with stainless steel trim plates.