20) 1/2" Bolt or Weld-On D-Ring Flatbed Truck Trailer Cargo Strap Tie Down Rings (20) 1/2" Galvanized D-Ring with Bolt-On Bracket Break Strength: 12,000 lbs Work Load Limit: 4,000 lbs Industrial grade galvanized steel Great for tarps, boat covers, cars, trucks, trailers and more Metals have a galvanized, zinc coated finish for rust and weather resistance