16.5 x 7 Brake Drum – 10 Hole Outboard Mount – 112 lbs – Replaces Gunite 3600AXRestore maximum stopping power to your heavy duty fleet with this 16. 5 x 7 Brake Drum. Engineered for truck rear axles and trailer axles with a 23,000 lb capacity, this severe duty brake drum is built to handle the intense heat and mechanical stress of frequent braking under heavy loads. Featuring a precision cast construction, it ensures a consistent friction surface for reliable performance and safety on every haul. Heavy Duty Engineering: The 16.