Description Strange Pro Series Rear Brake Kit for Olds Housing Ends – Kit Includes: 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 Caliper Brackets Brake Offset is 2.832″ (2.75″ commonly used)