The strongest, most versatile, corrosion proof shelving system in the world. All polymer corrosion proof shelving constructed of advanced polymers and Type 304 stainless corners feature removable, easy-to-clean shelf mats. Shelves adjust in 1" increments. Lifetime warranty against rust and corrosion. Built-in Microban antimicrobial product protection to keep the product "cleaner between cleanings". Add-on units consist of two posts and indicated number of MetroMax i shelves along with two "S" Hooks per shelf, for attaching shelf to adjacent unit. L-shaped configurations require a Corner Add-On "S" Hook Kit (MXCNR4/MXCNR5, sold separately).