This 7-piece brake backing plate mounting bolt kit delivers everything you need to securely install one 12-1/4" trailer brake backing plate. The complete hardware set includes 7 hex cap screws (7/16"-20 x 1-3/4"), 7 split lock washers, and 7 hex nuts, all meeting OEM-style specifications for a reliable, precise fit. Engineered for heavy-duty trailer brake systems, this kit is compatible with 10,000 lb, 12,000 lb, and 15,000 lb trailer axles that use a 7-hole mounting pattern. The standard bolt dimensions ensure strong clamping force and consistent performance under heavy loads and road vibration. Whether you're handling brake repairs, routine maintenance, or a full restoration project on a utility trailer or commercial axle assembly, this kit has you covered. Before ordering, verify your backing plate diameter, hole count, and required bolt size to ensure proper fitment.