This Hot Dipped Galvanized trailer axle U-Bolt Kit is designed to be used with 1 1/2 inch Square 1400lb capacity axles and mounts diagonally across the axle holding the leaf springs on. The leaf spring u bolt kit includes (2) Galvanized 1/2 inch diameter u bolts that are 2 5/8 inch wide inside and 3 9/16 inches long. Also included in this kit are (2) mounting plates, (4) nuts, (4) washers, and (4) lock washers.