1. Finish: Bright zinc plating. 2. Swivel: Double ball bearing with hardened raceways for extra strength. 3. Dust Cover: For all swivel models. Helps protect bearings for greater performance. 4. Construction: Made of heavy duty gauge steel and heat treated for extra strength. 5. Axle: 3/8"dia. bolt with lock nut for 3", 4" and 5"; 1/2"dia. bolt with lock nut for 6" and 8". 6. King Pin: 1/2" steel rivet hydraulically upset. 7. Brake:Top Lock Brake is available for swivel. 8. Fork Leg Spacing: 2". 9. Grease Seal: Optional.