USM Haller Mid- Credenza (DF) A functional office storage credenza with one drop down door and one extension drawer with letter filing. The doors lock with the twist of a coin. Available in 14 standard surface colors. The USM Haller Mid- Credenza (DF) provides secure yet stylish storage for all manner of office supplies, with its lockable doors and extension drawer. It's the perfect solution for any workspace, in a range of 14 colors.