The strongest, most versatile, corrosion proof shelving system in the world. All polymer shelving constructed of advanced polymers and Type 304 stainless corners. Shelves adjust in 1" increments. Removable, easy-to-clean open grid mats promote air circulation and light penetration. Lifetime warranty against rust and corrosion. Built-in Microban antimicrobial product protection to keep the product "cleaner between cleanings". Includes 2 swivel and 2 swivel/brake casters.