Gravity fed small animal feeder measuring 4 inches wide. Feed tube segments (each 6 inches tall) can be stacked to increase food capacity. Segments all snap together, glue is also recommended if the feeder will be hanging rather than sitting on the ground while mounted to a wall or cage wire. Eyelets in the tube segments fit standard 2 and 3 inch deck screws but also fit large zip ties as well for wire cage mounting.