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. Global Product Type: Hanging File Systems, Hanging File Systems Type: Add-On, Expandable, Single Pocket, For File Size: Letter, Overall Height: 8 15/16 in.