Provides extra space for bulky materials. Boltless assembly with snap together components requires no nuts, bolts, clips or tools. 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 baked enamel finish. This 72"W model with 900 lb. capacity per shelf includes 1 center deck support per shelf. , Lot of 1