uxcell Aluminum Backpack Spring Loaded Gate Carabiner Hook 3 Split Ring Keychain Holder Purple Use for attaching water bottle,camping gear and other things to your backpack when camping. Overall Size (Cluding Rings): 8.5 x 3.8 x 0.6cm/3.3" x 1.5" x 0.24" (L*W*D) Made from a new style lightweight aircraft aluminum alloy material. resistance to wear, high hardness and strong endurance. Carabiner Hook Size: 7 x 3.8 x 0.6cm//2.8" x 1.5" x 0.24" (L*W*D) Ring Diameter: 25mm/1"