The Seachoice Galvanized Square U-Bolt (1/2-13 x 3-1/16" x 6-5/16") is a robust, marine-grade fastening solution engineered to handle demanding, high-load trailer and suspension applications. Constructed from solid steel with a hot-dipped galvanized finish, this square-bend u-bolt is highly resistant to saltwater corrosion and harsh outdoor elements. Featuring a heavy-duty 1/2"-13 thread size, an inside width of 3-1/16 inches, and an extra-long inside length of 6-5/16 inches, it is designed to fit securely around 3-inch trailer frame rails while providing ample length to accommodate thick mounting plates and brackets.