Metal shelving units are manufactured from high-grade, 22-gauge steel with a powder-coated finish. Units are easy to assemble and shelves can be adjusted with compression clips. Enclosed units are available for added dust protection. Purchase shelving units alone or packaged with a number of plastic storage bin options.Per shelf weight capacity: 12″ x 36″: 500 lbs.; 18″ x 36″: 550 lbs.; 18″ x 42″: 355 lbs.; 24″ x 36″: 550 lbs.; 30″ x 36″: 600 lbs.