This Hot Dipped Galvanized trailer axle U-Bolt Kit is designed to be used with 2” Square 2,000# capacity axles with slipper springs and mounts diagonally across the axle.  You will have one u-bolt per leaf spring on each side mounting diagonally.  The leaf spring ubolt kit includes (2) Galvanized 1/2" diameter u bolts that are 3 1/16" wide inside and 4 5/16" long.  Also included in this kit are (2) mounting plates and (4) nuts, (4) washers, and (4) lock washers.