Each trolley holds a single Slim Jim® Rectangular Waste Container (sold separately). Link two or more together for efficient collection and transport of multiple containers. Mark-resistant swivel casters. Plastic construction eliminates the sharp edges and rusting common to metal trolleys. 23-7/16w x 15d x 10-3/16h. Sold by the each. (Does not work with vented Slim Jim®) Sold by the each.