Product Info: Part: Disc Brake Rotor Color: Black Rotor Style: Drilled and Slotted Center Hole Diameter: 72.5 millimeters / 2.85 inches Discard Thickness: 10.4 millimeters / 0.41 inches Nominal Thickness: 12 millimeters / 0.47 inches Outside Diameter: 320 millimeters / 12.