Industrial grade steel construction with Z-Beam design for strength and rigidity. Holds up to 4,000 lbs total with its five fully adjustable shelves, or 800 lbs with each shelf. The five shelves are fully adjustable every 1-1/2" to create a customized storage space with ease. Laminate board shelves resist moisture and are easy to clean. Smooth post design conceals assembly. Assembles in minutes without nuts or bolts as a vertical shelving unit or horizontal as a workbench. Durable and attractive silver vein finish.