Designed to transport oversized, bulky items. Sturdy structural foam construction won't rust, dent, chip or peel. All plastic design provides easy maintenance and quiet operation. Large, non-marking 5" diameter casters reduce touch-up cleaning. Molded-in cord wrap manages extension cords. Optional middle shelf available. Flat top is a convenient work surface. Capacity: 500 lb. Max cart, 250 lb. per shelf.