The Curt Manufacturing weight distribution hitch is a specialized towing system that provides improved vehicle and trailer control by leveling the trailer and more evenly distributing its tongue weight across the trailer's and vehicle's axles. Weight distribution hitches are commonly used on travel trailers and campers but can also be applied to other large loads.This replacement spring bar chain kit is designed to fit a variety of Curt Manufacturing weight distribution hitches, including trunnion bar and round bar. The chains help attach the spring bars to the trailer, using hookup brackets, and provide easy spring bar tension adjustment. This kit includes two complete spring bar chains with two chains, two U-bolts, four lock nuts and four washers. Spring bars are not included.