Material: The D-ring fasteners are made of high quality metal, which has strong anti-rust properties, sturdy and durable, and has a long service life. Package Content: The storage box contains 6 sturdy lashing rings and M6 screws. EASY INSTALLATION: The lashing rings are easy to install with only 2 screws. Easy to remove and install. Wide Applications: D-ring tie downs are widely used as tie down anchors on trucks, vans, kayaks, RVs, vans, boats and trailers. They can also be used in garages, warehouses and organized workshops. Wall hooks. Note: The data is all measured manually, there may be 1-3cm deviation due to light and display differences, please refer to the actual item you received.