ACDelco Silver Rear Brake Rotor (part number 18A82039A) is a solid brake disc rotor made of cast iron, designed for direct replacement on the rear placement of Chevy Colorado 2015-2020. It comes in a pack of one with six lug holes and a bolt circle of 120mm. The rotor height and item height are 78.74mm, and the item thickness is 120mm. The rotor finish is non-coated, and the ABS ring option is not included.