Move your Whitney Brother cubes or the Nature View Reading Haven with these mobile caddies. These easy to assemble caddies give custom fitted mobility. There are four discreet pre-drilled screw holes and screws to secure the cube to the caddy. Constructed of durable birch plywood and finished in a safe, non-toxic natural UV finish. The finish won't yellow and can withstand rigorous use. Casters can be locked.