Works on 14 bolt single rear wheel axle;51-1/4 inch long;Made from 3/8 inch and 1/4 inch mild steel;Strengthens axle and link mounting surface;Reinforced using interlocked 1/4 inch gussets; California Residents: WARNING This heavy duty truss system is designed to take serious abuse and reinforce your entire axle while also providing a flat surface to mount your upper links. The 3/8 thick truss top and 1/4 thick gussets incorporates a unique design to strengthen both the axle and the link mounting surface. Truss is low profile allowing link joints to be mounted with ideal geometry, about 8 inches from the axle centerline. Truss spans entire length of axle for complete reinforcement of the axle tubes, not just for mounting links. The SRW truss is just under 51 1/4. This kit requires general welding and fabrication skills.