For use with Heavy-Duty Mobile Work Center only. Available Accessories: Pegboard or Louvered Panels are 16 gauge formed steel panels that accept most standard pegs and bins. (Pegs and bins not included.) Bin Rail Attachment: Single 16 gauge steel louvered rail is 6″ high Shelves: Lipped shelves: 1-1/2″ lip measures 11″D x 33-3/4″W Flush shelves have a flush edges and measure 11″D x 33-3/4″W