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 1-1/2 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.