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Designed to stop you. Built to keep you going. The 51528B has the same specifications as the 61528B. Webb offers the broadest brake drum and is considered the industry standard for quality wheel end equipment. Webb products are designed and developed using 3-D solid modeling, element analysis, and design/process failure mode & effects analysis. Webb also uses fatigue, durability and corrosion resistance verification tests to provide our customers with lightweight yet durable products sure to meet transportation and operational cost needs. Webb brake drums are made from a high grade of cast iron for long service life and conform to SAE Recommended Practices. Webb's brake drums are continuously examined and refined through stringent testing for maximum performance and complete accountability. Specifications: 77 pound weight, 'H' style, outboard mount, 15.00\" brake surface diameter, 8.86\" overall depth, 4.72\" brake surface flat, 8.78\" pilot diameter, 11.25\" bolt circle diameter, 1.28\" diameter 10 hole bolt pattern, Finished, balanced