8cm metal backpack buck quickdraw carabiner aluminum buckle backpack. 

Length: 78mm; Diameter: 8mm; Width: 42mm (widest point); Weight: 22g. Rigid aluminum alloy, extremely hard.

Using D-type aluminum alloy polished, waterproof, wear-resistant, high strength, durable. You can hang on backpacks, key rings, kettle and all the necessary place, used for tents, ropes and other connections.