Floating Rotor Adapter for Asphalt Racing Hubs with backside mounts. With a hub mount bolt circle of 5 x 5.00 and will mount any 8 x 7.00 bolt circle rotor. Made from high strength aluminum alloy with a corrosion and wear resistant Type III hard anodize finish.. Use 230 - 6710 Rotor Bolt and T - nut Kit to attach rotors.