The Atro Trailer Upper Control Arm Bushing & Bolt Kit is designed to provide superior performance and durability for your trailer. This kit includes four bushings, four pivot bolts with a hex head, eight hard washers, four lock nuts, eight thrust washers and two pivot bolt washers. The bushings and bolts are designed with a progressive load design that allows them to handle heavy loads while maintaining a smooth ride. FleetPride is your First Click in Heavy Duty®.