Product Info: Part: Rotor Finish: Coated Rotor Style: Dimpled and Slotted Center Hole Diameter: 79 millimeters / 3.11 inches Discard Thickness: 28.4 millimeters / 1.12 inches Nominal Thickness: 30 millimeters / 1.18 inches Outside Diameter: 370 millimeters / 14.