MetroMax® 4 Mobile Shelving Unit, five tier, 48"W x 24"D x 80"H, (4) open grid polymer shelves & (1) solid sectioned mat shelf, each with removable shelf mats, unit load capacity of 750 lbs., (4) polymer MX74UP posts, wedge connectors, (4) polymer casters (2 swivel & 2 braked), built in antimicrobial product protection, NSF