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:Both Top Lock Brakeand Maxi Lock Brake are available.