MetroMax 4 Open Grid Industrial Plastic Shelf features corrosion-proof performance, proven Metro stability, and unrivaled value. All-polymer corrosion proof shelving with removable open grid mat. Shelves and polymer posts offer a lifetime warranty against rust and corrosion. Shelf mats, beams, and posts have built-in Microban ® antimicrobial product protection. Rigid four-sided shelf frame and robust corner with complete 360° capture of the wedge and post ensure stability, strength and structural integrity.  Units assemble easily— shelves mount on four one-piece wedges along grooved, numbered posts. Shelves adjust on 1" increments.