Metal Bottle Guard keeps small animals and reptiles from chewing on their water bottles. Quick-release spring bottle holder keeps water bottle in place. Made of chew-proof, rust-resistant galvanized metal. Includes both an eyelet and a metal hanger for attaching to hutch, fence, or aquarium. Fits Pet Lodge 8-Ounce Opaque or Clear Plastic Water Bottle (Item Nos. OPB8 and CPB8, each sold separately).