The Bronco Round Waste Container Dolly has 5 swivel casters and fits 20, 32, 44, and 55 gallon trash cans for safe transport of heavy loads. Simple twist-to-lock feature securely fastens dolly to container base. Non-marking 3 inch swivel casters cleanly roll over a variety of indoor and outdoor surfaces. Threaded, replaceable casters extend dolly life. Replacement casters sold separately. - Plastic; black - NSF listed - Diameter 17-9/10 in - Height 5 in - Sold per each