PENCO Rivet-Rite Double-Rivet Bulk Storage Shelving provides an economical solution for the storage of retail, wholesale, or industrial goods. Standard and heavy-duty beams are available depending on your load requirements. Starters and add-ons all include standard beams. Starter and add-on units are all 7'H with four shelves that adjust in 1-1/2" increments. Decking and center supports are sold separately. 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.