Cordon Oasis bottle holder is uniquely designed for small animals to hold and protect oasis water bottles and bell bottles. The metal retainer ring flips-down to secure the bottle in the holder. The guards are constructed of 22-guage plated steel with a baked on corrosion proof powder coating for durability and pleasing appearance. The wrap-around guard, prevents gnawing animals from damaging the edges of the bottle and/or cap. Use the adjustable strap hanger and bend to fit most wire cages, pet carriers and glass aquarium-type cages. When used in glass cages, the strap hangs over the upper edge anywhere around the top of the frame. Basic hold-guards can also be securely attached directly to wooden cage walls with an #8 or #10 wood screw. Available in 4-ounce size.