You can use it to carry some things when you are camping outside, eg: bottle, small bag. It is easy to open and close, if you want to hook your things, just press on and then loose it. Owing to its compact size, it is convenient to take along. Note: not for climbing or safety equipment.Features:1. The carabiner clip can be attached quickly, one-handed operation, easy to open and lock.2. The surface of the spring clip is smooth, no burrs or sharp edges, quite safe to use.3. The carabiner clip allows for quick attachment/detachment of key rings, bottles, ropes and chains.Material: Aluminum AlloyRing Diameter: Outer: 25mm / 0.98Inner: 22mm / 0.86Size(not include the ring): 50 x 24 x 4.5mm / 1.9 x 0.9 x 0.2(L*W*T)Color: Blue, Red, Green, Gold Tone, Silver ToneNet Weight: 73gPackage Content: 12 x Carabiner Hook