MetroMax 4 is an all polymer corrosion proof shelving system with removable open grid or solid shelf mat sections. Shelf mats, beams and posts have built-in Microban antimicrobial product protection. All shelves have circumferential capture of corner posts for superior stability, performance and structural integrity. Rigid construction delivers stationary units with maximum capacity of 2000 lbs. (907kg) evenly distributed. Mobile units consist of a MetroMax i bottom shelf and MetroMax 4 upper shelves combined with posts and casters. Carts are capable of transporting a maximum total unit load of 600 lbs. (272kg) evenly distributed. Units assemble easily; preassembled shelves mount on four one-piece wedges along numbered posts and may be adjusted on 1" (25mm) increments. Shelves and polymer posts carry a lifetime warranty against rust and corrosion. NSF Listed for all environments.