The heavy-gauge steel frame of Smith System's Cascade Series Four-Shelf Mobile Storage endures heavy use for years and resists dents, dings and scratches. Adjust the three large shelves to better suit your storage and transport needs. The stylish design allows for unobtrusive placement in your work area. Four heavy-duty swivel casters let you move the unit, so you can transport large items with ease. The end panels come in your choice of colors.