METRO METROMAX i Shelving with Microban is completely corrosion-proof. Easily cleanable and removable polymer shelf mats with Microban® and polymer posts. Shelves adjust along numbered grooved posts, and adjust in 1/2" increments. Starters include four posts; add-ons include two posts and two S-hooks per shelf. Both have a lifetime warranty against corrosion and rust. Will not interchange with MetroMax manufactured before April 2009. NSF listed.