This single axle trailer leaf spring hanger kit comes with everything you need to attach your slipper leaf springs to your trailer. In this kit you will receive two weld on front hangers and two weld on, C shaped, rear hangers designed to be used with a 1 3/4" wide slipper spring. The rear of the slipper spring is designed to slip into the weld on C hanger. This spring hanger kit also includes two leaf spring mounting bolts and nuts that are 9/16" diameter and 3" long. You would use this kit to replace a damaged or rusting suspension system on your trailer. This kit would need to be welded to your existing trailer frame. It can be painted or coated after welding to achieve the desire look to match your trailers frame.