Fortpro Drum Brakes are precision-machined to provide an optimal fit and performance. This means that you can count on our brakes to deliver consistent and reliable stopping power every time you hit the brakes. In addition, our Front Drum Brakes are designed to meet or exceed OEM specifications, so you can be confident that they will work seamlessly with your vehicle. Whether you are driving a semi-truck, light truck, or heavy-duty commercial vehicle, our Drum Brakes are sure to provide the reliable and high-quality braking performance you need to stay safe on the road. Specifications Product Line: Brakes Category Name: Brake Drums Part Type: Brake Drum OEM Part Number: 3687 Application Type: Heavy Duty Trucks, Semi-Trucks Bolt Circle Diameter (BCD): 11.25 in. Bolt Hole Diameter: 1.25 in. Bolt Hole Quantity: 10 Mounting Type: Outboard Pilot Diameter: 8.78 in. Wheel Type: Disc Brake Diameter (I.D.): 16.50 in. Brake Size (Dia x Width): 16.50 in. x 6 in. Brake Shoe Width: 6 in. Brake Surface Width: 6.52 in. Axle Rating (Capacity): 20.000 lb. Mounting Flange Thickness: 0.62 in. Cross-references 2010238C1, 3398-3687, 33983687, 3687, 3687X, 3933825, 3947718, 85123399002, F0HZ1125C, ZBR3687