|Over 60% lighter than our steel series! .050 or .063 Aluminum forms all parts of these heavy-duty carts except for the wide 1” diameter steel handle. Carts are powder coated with a textured finish to resist scratches. Heavy-duty casters are designed to take the load. Includes a floating tray that lowers as materials are added, and raises as materials are removed. There’s no stooping while unloading as the materials rise to a comfortable unloading height! The Super and Ultra capacities have four 4” casters, (2-swivel, 2-locking).