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. Unit includes 3 levels, adjustable at 1-1/2 increments. Heavy-duty roll-formed steel framing with chip resistant gray baked enamel finish. All models have double riveted beams for maximum frame rigidity. Supply your own decking.