Quick adjustment and the strength of steel. Removable polymer shelf mats for easy cleaning. Quick-adjust shelves can be positioned in 1" increments along the length of the post. 15-year warranty against rust and corrosion. Microban antimicrobial product protection is built into the finish to keep the product "cleaner between cleanings." Add-on units consist of two posts and indicated number of MetroMax Q shelves along with two "S" Hooks per shelf, for attaching shelf to adjacent unit.