Zinger Removable Caster Wheels - Set of 4Description Perhaps the most handiest accessory to add to your Zinger crate is the removable caster wheel kit. The heavy duty construction of the corner bracket acts to protect your crate from damage as it makes it way through airports, show rings and rough handling baggage handlers. Each kit includes the caster plates, mounting hardware and casters. The casters are 3" polyurethane tires, which are molded onto a hard rubber hub. All 4 wheels swivel