Expandable system begins with the Basic Pocket that mounts flush to wall. Use the Add-On Pockets to increase storage. 1 5/16" capacity. Includes a deluxe Hot File label holder with blank label and clear protective sheath. Plastic. 13w X 8 15/16h space requirement. Hanging File Systems Type: Basic, Expandable, Single Pocket; For File Size: Letter; Overall Height: 8 15/16 in; Width: 13 in.