Product Info: Part: Brake Drum Position: Rear Classification: Silver Material: Cast Iron Brake Surface Finish: Directional Maximum Brake Diameter (Discard): 9.09 inches / 230.89 millimeters Bolt Hole Quantity: 5 Outside Diameter: 0.42 inches / 10.65 millimeters Stud/Lug Hole Diameter: 0.566 inches / 14.4 millimeters Nominal Drum Diameter: 0.