The fasteners D rings are made of high quality steel. High tensile strength for extra strength and long life and can withstand loads of up to 1,200 pounds per ring. Load anchor coupling rings are made of solid galvanized steel. extremely durable to withstand harsh conditions. corrosion and rust. The anchor D rings provide convenient anchor points for ropes, bungee cords or straps. They are commonly used as anchor points on trucks, vans, kayaks, ATVs, caravans, vans, boats and trailers, as well as wall hooks in garages, warehouses and organized workshops. This clip is suitable for all surfaces and floors. These D rings come with mounting brackets but no screws. It is recommended to use 1/4" diameter round head screws to install the 9/32" holes in the mounting clips. Once these D-rings are installed, you can use them as tie down anchors for motorcycle straps, bungee cords, tarp straps, small chains, webbing à ratchet and cam, ropes and other fasteners. Ideal for stationary kayaks, ATVs