1. Finish: Bright zinc plating or Bright nickel plating. 2. Swivel: Double ball bearing with hardened raceways for extra strength. 3. Dust Cover: Helps protect swivel bearings. 4. Construction: Heavy duty gauge steel formed for extra strength. 5. Axle: 3/8" dia. bolt with lock nut. 6. Brake: Top Lock Brake and Maxi Lock Brake available for swivel.