[Specifications] Rotor: Type: Vented. Rotors Material: Steel. Outside Dia: 11.65 in. Hub Holes Centering Dia: 2.68 in. Mounting Bolt Hole Quantity: 5. Bolt Circle Dia: 4.5 in. [Pad: Friction Material: Ceramic. Pad Backing Material: Iron. Pad Width: 5.58 in. Pad Height: 2.32 in. Pad Thickness: 0.68 in.]