1. Material:Stainless steel 2. Swivel:Double ball bearing formed raceways for extra strength. 3. Grease Seal:Helps retain lubricant for easier swiveling and longer bearing life. 4. Rigid:Welded with heavy duty gauge stainless steel for extra stength. 5. Riveted King Pin:5/8" dia 6. Construction:Formed from 1/4" thick stainless steel for extra strength. 7. Grease Fittings:Provided in swivel raceway and wheel bearings. 8. Axle: 1/2" dia. bolt with zerk and lock nut. 9. Brake+Lock: Top Lock Brake and Swivel Lock available for swivel. 10. Fork Leg Spacing: 2-1/2"