SET OF 10 HEAVY DUTY D-RINGS: This set includes 10 stainless steel D-rings. The ring measures 4.6 x 3.8 cm and has a thickness of 6 mm. They come with a mounting bracket. They measure 2 x 5.6 cm and have a hole diameter of 6.5 mm. The distance between the holes is 3.6 cm. HIGH LOAD CAPACITY: Our trailer hitch ring is strong and durable. Since they are made of iron, they are resistant to rust and corrosion. Each tow hook can hold 400 kg and has a center width of 2.6 cm. Each fastener is galvanized to ensure a long service life. The mounting bracket will secure the hoop to your wood or concrete surface. EASY TO INSTALL: Each car towing eye can be easily attached with just two screws. This complete kit includes all the screws you need to mount them to a surface. Simply mark where you want to drive the screws, drill the holes, and place the brackets and rings in their final locations. You can then secure it using the screws provided. DESIGNED FOR HEAVY LOADS: This trailer D-ring bracket provides a convenient anchor point for a variety of vehicles including trucks, cars, vans, kayaks, boats, ATVs, and trailers. Use them for camping gear, sports equipment, heavy machinery, and power tools. They can also be used as wall hooks to organize garages, warehouses, and workshops. They can even be used at home to hang heavy objects. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.