Brake Caliper – D52 – 2 Piston – Forged Aluminum – Black Powder Coat – 12.190 in OD x 1.040 in Thick Rotor – 7.060 in Floating Mount – 1pc. Forged billet aluminum bodies stainless steel pistons and competition style high-temperature seals put and end to the rust bore pitting and seal failures that plague the Original Manufacturer caliper design.