Commonly made of polypropylene plastic, Bucket Dollies normally accommodate from 3.5- to 7-gallon buckets. With reinforced sides, low centers-of-gravity, and five swivel casters, they are designed to move, turn, and roll over cracks/crevices with minimal chance of tipping. Some models feature lockable casters and thumb screws to ensure that the dolly and bucket stay in place (even on steep inclines). Others also provide bucket lids that allows the dolly to function as a rolling seat.