Robustness and durability – D-ring anchors are 1/4" thick in diameter, sturdy and durable, and each D-ring can support a load of 1200 lbs. These rings are equipped with mounting brackets and screws, and the included mounting plate/bracket allows the D-rings to flip to any angle within 180 degrees. Corrosion and rust protection - D-ring anchors are made of high-strength solid metal and coated with a high-quality black protective coating to prevent rust. The anchors are coated with a quality coating to prevent rust, you You should never worry about rain or other things rusting the bolts, they should stay in good waterproof condition Dimensional Information - - D-ring tie-down anchor inner space: 1" x 1 3/8", mounting bracket: 2 1/4" x 3/4" x 1/8". Hole: 1/4" (6mm) Wide range of applications - tie-down rings are versatile surface-mount fastening devices that add a convenient attachment point to ropes, bungee cords, or belts, perfect for cargo management of trailers, trucks, vans, pickup