Industrial grade steel construction with Z-beam design for strength and rigidity. Holds up to 4,800 lbs. total weight, or 800 lbs. per shelf, based on evenly distributed loads. The six shelves adjust every 1-1/2" to create a customized storage space with ease. Laminate board shelves resist moisture and are easy to clean. Assembles in minutes without nuts or bolts as a vertical shelving unit or horizontal as a workbench. Silver enamel finish. Unit is NSF Certified.