Material: Steel The heavy-duty D-rings are made of high-strength steel. They have a breaking strength of 544 kg and a working load capacity. The D-ring fasteners are made of heavy-duty galvanized steel for durability and resistance to damage. The D-ring anchor kit includes eight D-rings and eight mounting brackets. Each mounting bracket measures 6 x 2 x 0.3 cm, and the D-rings measure 4.5 x 4 x 0.6 cm. The holes are located on the top. The D-ring anchors require rope, a bungee cord, or a strap, along with basic hardware, for easy attachment to metal or wood floors. They are widely used as anchors for trucks, vans, kayaks, ATVs, campers, vans, boats, and trailers, and can also be used as wall hooks in garages. D-ring anchors are ideal for securing cargo in boats, cars, campers, kayaks, ATVs, and RVs, and are also suitable for indoor use. Ring Dimensions: Ring Dimensions: 4.5 cm x 3.2 cm x 0.5 cm Lock Dimensions: 5.5 cm x 2 cm Hole Diameter: 0.65 cm Type: Type: Tie-Down Ring Material: Galvanized Steel Color: Silver Versatile Uses Used for securing kayaks, ATVs and other sporting equipment, bicycles, refrigerators and similar appliances, shipping and moving boxes, camping gear, etc. D-Ring High-strength steel with an assembled breaking strength of 544 kg. Easily attaches to metal or wood surfaces with just two bolts and basic hardware. Ideal for securing kayaks, ATVs and other sporting equipment, bicycles, refrigerators and similar appliances, shipping and moving boxes, camping gear, etc.