LARGE LOAD CAPACITY: Our trailer tie-down rings are strong and durable. As they are made of stainless steel, they are rust-proof and anti-corrosive. Each fastener has been galvanized to ensure long-lasting durability. The mounting brackets will anchor the hoop to wooden or concrete surfaces. EASY TO INSTALL: Each car towing ring can be easily attached with just two screws. This complete set includes all the screws you need to secure them to your surface. Simply mark where you want the screws, drill your holes, and place the bracket and ring in their final position. You can then secure with the provided screws. DESIGNED FOR HEAVY LOADS: This set of D-ring trailer tie-downs provides a convenient anchor point for many vehicles such as trucks, cars, vans, kayaks, boats, quads, and trailers. Use them for camping equipment, sports equipment, heavy machinery, and power tools. They can also be used as wall hooks for organizing garages, warehouses, and workshops. They can even be used at home to hang heavy objects. Size: 60 x 28 mm, diameter 6 mm, hole spacing 40 mm, screw length 19 mm, diameter 4.8 mm. Name: D-type pull ring. Specifications: 6 mm Color: stainless steel Material: 304 stainless steel