Super Bell's Finned Aluminum Backing plates act as a rotor shield, caliper bracket, and air scoop for cooling the rotors. These plates have been designed to work with our Super Bell's Super Stopper 3/8 and 1" rotor kits but will cross over to similar kits with some modifications. (modifying voids warranty) *Designed to only* work on Super Bell's Super Bell's Super Stopper brake kits.