3CERA&reg; 1pcx Convenient Carrying Alloy Water Bottle Holder Carabiner Hook Buckle .This bottle holder can be used for taching the bottle, pouch, small bag or some other things to the backpack bag when climbing, hiking or travelling. Bottle holder hole diameter: 2.7cm Strap width:2.7cm Color: Black, Blue, Red, Purple, Green, Silver, Gold ( we sent color random) Handy tool for climbers, campers, school students, travelers, etc It can also add keys, IDs, Badges, reels and many other items to the split ring.