This Hot Dipped Galvanized trailer axle U-Bolt Kit is designed to be used with 2” Square 2,000 lb 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 u bolt 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. This kit is NOT intended for use with our Dexter 2,200 lb Axles. This is a replacement kit for what you would already have on your trailer.