WorldPac (Pack of 4) Heavy Duty 3/8" 5,000lbs Anchor Point Surface Mount Tie Down D Ring Pack of 4: D Ring and Bracket, allow each corner to have an anchor point for convenience Heavy Duty, 3/8" Forged Steel with Zinc Plated for Weather Protection with 5,000lbs Break Strength D Ring Bracket can be Bolt On or Weld On for Easy Installation Dimensions: 10mm thick Ring, 2.25" Diameter Will work on Trailer, Enclosed Trailer, Van, Truck, Flatbed, Truck or Anchor Point Bed