The universal fit water bottle bracket. Chew proof holder is made of high grade steel construction with epoxy coated finish. Slides on to any wire cages, hangs on any aquarium, or attaches to wooden walls with a screw (not included). EZ to use, totally adjustable hanger features a secure spring holder. This size will hold any standard 4 oz. or 8 oz. water bottle. Actual size, 6.75" long, 1.6" wide.