500 X 5 kit – super heavy duty, magnesium wheel and brake. Static capacity 1,260#, limit load 4550-lbs. Brake rating in kinetic energy capacity 192,000 ft-lb. Kit contains 2: CWB40-151 wheel assemblies which include 2: CWB164-85 discs, and 2: CWB30-133 brake assemblies with 4: CWB66-105 linings. Use AX5 – 1-1/4″ axles, 1 – A484 spacer & 1 A484- 4357 per axle with MS21025-20 nut. NOT compatible with SALT.