Heavy duty wheel and brake kit. Static capacity 1,260#, limit load 4550-lbs, brake rating in kinetic energy capacity 155,000 ft-lb. Kit contains 2: CWB164-99 discs, 2: CWB30-181 brake assemblies with 4 – CWB66- 106 linings. Use AX5, 1-1/4 axles, 1: A484 spacer and 1: A484-4375 spacer and MS21025-20 nut per axle. NOT compatible with SALT.