The CURT 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 hardware kit for round bar weight distribution hitches includes the necessary hardware for adjusting the weight distribution head on its shank. Adjusting the WD head allows you to find the exact trailer ball and spring bar angle to perfectly level your tow vehicle and trailer. This kit includes a 1" rivet and seven washers for precise adjustment and comes with a zinc finish to withstand rust and corrosion.