The multipoint mechanical, electromechanical and electric motor mortise locks 319/519/819 have 3 locking points. These solutions are usable up to door height of 2.15 meters.

If the door is higher, these additional (4th) bolts make the mortise locks usable.
The following extensions are available:
- 270 mm from ca. 2.16 m door height
- 350 mm from ca. 2.25 m door height
- 550 mm from ca. 2.45 m door height

This way secure locking can be extended to high doors too, to there, where until now, the parts lying higher were weak on the security side.