1,Tie down for RV Camper or Trailer 2,Zinc plated steel 1,Tie down / D-ring for campers and trailers. 2,It is made with zinc plated steel. 3,Each tie down is rated for 400 lbs. It is about 5" long and 3-1/2" wide. 4,The steel rod used for the D-ring is 1/4" in diameter, and the D-ring is completely welded for added strength. D Ring / Tie Down for RV Camper or Trailer