This modular cage base on wheels makes it easy to move our ProSelect Modular Cages and X-Tall cages. Can be used for individual cages, or for stacks of multiple cages. Use this base to roll cages from one place to another. Helps to save your back, and makes cleaning easy. This modular cage base on wheels makes it easy to move our ProSelect Stainless Steel Modular Cages (ZW5500) and X-Tall Modular Cages (ZW5550). Can be used with individual cages, or for stacks of multiple cages.