The Sport R1 At The Wheel kit is designed for the car owner who wants to ungrade their brakes without added expenses. SSBC boasts over 34 years of manufacturing and engineering the finest disc brake products. The single piston caliper includes a built-in parking brake and piston sizes from 45mm to 54mm. The kits come with a variety of rotor diameters ranging from 10.5 to 12.8. The kits work on most factory parking brake cables and provide an easy bolt on installation. Optional polishing or powder-coating is available in most applictions. All hardware is included.