Aluminum Alloy Carabiner is made of wear-resistant material, 55 Lbs load capacity, automatic rebound, and opens and closes smoothly. Great for connecting backpacks, camping gear, keys, and more. Features include a hard aluminum alloy material, 10cm/3.9in length, 6cm/2.3in width, 6.8mm/2.6in line thickness, 2.8cm/1.1in opening, and 25g weight.