MetroMax® 4 Add-On Shelving Unit, 36"W x 21"D x 74"H, rust proof, 800 lb capacity per shelf, 2000 lb. capacity per unit, includes: (4) open grid polymer shelves with removable shelf mats, bag of (4) wedge connectors for each shelf, (2) polymer posts & (8) "S" hooks for an end-to-end configuration, Microban antimicrobial product protection, KD, NSF