The Sumner Mac Rack I (Model 783317) is a mobile storage cart with eight fold-down arms and 6″ heavy-duty casters. It’s constructed from double-wall square tubing with heavy-wall arms and a durable powder-coat finish. Patented stacking allows compact storage and inter-cart stacking. Ships fully assembled for quick deployment on job sites. Loads up to 1,000 lb (455 kg), height folded 17.75″ to open 61.5″ (45 to 156 cm).