1Wide Application: Heavy duty D ring is widely used as a tie down anchor on trailer, trucks, Rv, campers, Vans, Atv, Suv, boats, motorcycle, pickups, kayaks, etc. 2Other Purpose: Also great for any type of hooks in garages, warehouses, and workshops deliveries, etc., convenient for safe and secure hauling, hooking, mooring. 3Zinc Coating: The surface is zinc plated to cut off the contact between the D ring and the air to avoid rusting, and can be used outdoors and in humid areas for a long time. 4High Hardness Material: The tie down anchors are forged from the best iron metal, which has high strength, strong tensile force and is not easy to break. 5Easy to Operate: Surface mounted tie down D rings add a convenient anchor point for cords, bungee cords or straps. Easily attaches to metal surfaces or wood floors with just two bolts and basic hardware.