Provides extra space for bulky materials. Snap-together assembly allows fast, tool- and hardware-free setup. Uprights are a substantial 1-1/2″ x 2-1/4″ x 14 gauge steel. All models have double riveted horizontal beams for maximum frame rigidity. Unit includes 3 shelves, adjustable at 1-1/2″ increments. Decking is made of sturdy 1/2″ thick particleboard covered in rugged white laminate. Heavy-duty roll-formed steel framing with chip resistant gray baked enamel finish. This 72″W model with 900 lb. capacity per shelf includes 1 center deck support per shelf.