The Sparco Stak-A-File Vertical Filing System makes it easy for you to ensure that everyone at work gets mail on time. It s a much more space efficient solution than filing cabinets that take up floor space or that sit on a countertop. This wall filing system comes with three units which you can stack together or install separately. This set comes with screws and anchors to make mounting fast and easy. The translucent smoke color lets you see if you have mail but obscures the contents for your privacy. Each piece is large enough to hold multiple documents from letters to file folders. They re made from plastic to be lightweight and easy to set up and transfer. You can add multiple packs stacked directly above and below one another for larger offices. This product is ideal for medical legal and other professional environments.