Product Info: Part: Disc Brake Rotor Color: Black Rotor Style: Drilled and Slotted Center Hole Diameter: 79 millimeters / 3.11 inches Discard Thickness: 22.4 millimeters / 0.88 inches Nominal Thickness: 24 millimeters / 0.94 inches Outside Diameter: 330 millimeters / 12.