Durable epoxy coated PENCO Rivet-Rite Double-Rivet Bulk Storage Shelving with Wire Decking provides greater visibility of bulk merchandise while allowing light to penetrate and air to circulate around items for dust-free storage. Increases effectiveness of overhead sprinklers in case of fire. All units are 7'H and contain four shelves that adjust in 1-1/2" increments. Center beam supports (included) add overall stability to shelving system. Heavy-duty roll-formed steel framing with chip-resistant baked enamel finish. Made in USA.NOTE: Combine to form rows. Add-ons include a pair of tee posts. Begin rows wtih posts from starter and join any number of add-ons to complete the row. Finish with posts from starter unit. NOTE: Easy assembly—all you need is a rubber mallet.