Extra durable unbreakable plastic construction holds up in busy environments. Easily mounts to wall (two screws and mounting tape included). Expandable system. Manufacturer's 100% unbreakable guarantee. Three-Pocket Set (DEF-63601RT/DEF-63602RT). Hanging File Systems Type: Expandable Single Pocket; For File Size: Letter; Overall Height: 6 1/2"; Width: 14 1/2".