Product Info: Part: Disc Brake Rotor Color: Black Rotor Style: Drilled and Slotted Center Hole Diameter: 75 millimeters / 2.95 inches Discard Thickness: 18.4 millimeters / 0.72 inches Nominal Thickness: 20 millimeters / 0.79 inches Outside Diameter: 324 millimeters / 12.