Ultra Hot File Single Pocket Wall FileCreate a personalized system—add one or more pockets using unique bin connectors, sold separately, to adjust space between files. Put together a combination to maximize your organization and efficiency. 3 7/8" deep files provide extra capacity. Plastic. Wall mount (hardware included) or hang with Partition Hangers, sold separately. Hanging File Systems Type: Expandable Single Pocket; For File Size: Legal.