When looking for the best, get something Sturdy Built. This is a full bunk bracket replacement kit, complete with mounting hardware. All parts are Aluminum & Stainless Steel for the best of the best Corrosion Protection in both Saltwater and Fresh Water locations. The Brackets are the industry standard 8 inches tall and will mount to a 3x3 Aluminum Cross Member using the included Mounting Hardware. Each L Type Bracket has multiple mounting holes for installing your 2x4 or 2x6 Bunk Boards Vertically at different heights. This Kit includes the 4 Bunk Brackets along with 4 mounting U Bolts and all the associated hardware: 2 washers, 2 lock washers and 2 hex nuts per U Bolt. Every piece is corrosion resistant to help protect against rusting.