Quantum Storage Systems AD74-1454C Add-On Kit for 74" High 4-Tier Wire Shelving Unit, Chrome Finish, 14" Width x 54" Length x 74" Height Kit comes complete with 2 posts and 4 shelves and (8) S-hooks All welded construction with additional wire trussing for high strength characteristics Wire allows air to circulate and light to penetrate for increased product visibility 600 to 800 lbs capacity per shelf, Minimal dirt accumulation Measures 14" width by 54" length by 74" height