Add-A-Shelf Starter Unit, 4-tier, 48"W x 21"D, (2) wire shelves on top & bottom with patented QuadTruss design, (2) Add-A-Shelf intermediate shelves, (4) 74"H Red-i-Pak posts, includes (4) bags of split sleeves & (2) bags of Add-A-Shelf collars, black epoxy finish, NSF