Montana - Free Shelving System 555000 (Replaces 555100)Montana Free Shelving system consists of 12 standard compositions that you can choose with an optional interposed shelf The Free 555000 pictured here is the 2nd largest size available that sits 5 shelves high. The standard compositions range in size and function from the smallest design: a two shelf high bench that can fit under a window to the largest solution: a six shelf high unit perfect as both an airy and decorative room divider or a spacious