Description Strange Pro Series Dual Rear Brake Kit for ’57-’64 Olds Housing Ends 1 Piece Forged Steel, Directional Slotted Rotors Uni-Lug Rotors Drilled 4 1/2″, 4 3/4″ & 5″ bolt circles for both 1/2″ & 5/8″ studs 4 Piston Aluminum, Directional Calipers Semi-Metallic Brake Pads Aluminum Dual Caliper Brackets