Save time and money by eliminating adjacent posts and replacing with "S" hooks. Super Erecta Pro shelves features Metroseal Green epoxy coated Super Erecta-style frames with removable polymer shelf mats. Shelves can be repositioned at precise 1" (25mm) increments along the length of the numbered posts. Microban antimicrobial protection makes Super Erecta Pro shelving easier to clean and keeps it cleaner between cleanings. Add-on units consist of two posts and indicated number of Super Erecta Pro shelves along with two "S" Hooks per shelf, for attaching shelf to adjacent unit.