500 x 5 kit with aluminum wheels and brakes – heavy duty. Static capacity 1,260#, limit load 4550-lbs. Weight per kit 12.40 lbs. Brake rating in kinetic energy capacity 117,500 ft-lb. Each kit contains 2: CWB40-78A wheel assemblies which include 2: CWB164-17 discs, and 2: CWB30-9A brake assemblies with 4: CWB66-106 linings. Chrome discs available by ordering CWB199-103C. Other kit items the same. Use AX5 – 1-1/4″ axles, 2- A484 spacers per axle and MS21025-20 nut.