What is a master key?
A master key system enables various persons with different access authorizations to open all relevant doors with only one key.

Advantages of a Master Key

-Security with only a few keys.
-Comfort, since there is only one key for all relevant doors.
-Organization is simplyfied.
-You can exactly determine, which persons have access for which rooms.
-All cylinder locks and types (main entrance, internal doors, garage doors...)
can be opened with one key.

Example of a Master Key System for a building with two offices

GMK:	General Master Key opens all doors (e.g. for security guard).
MK 1:	Master Key 1 opens all doors for Messrs. Smith (e.g. for Director Smith).
1SMK 1:	Submaster Key 1 opens the main entrance and all adjoining rooms (lavatory, kitchen, store room, ...)
1SMK 2:	Submaster Key 2 opens main entrance, adjoining rooms and all secretary doors (e.g. key for secretary of director Smith).
MK 2:	Master Key 2 opens all doors for Messrs. Berger.
2SMK 1:	This submaster opens only the doors of the purchasing and sales area, the main entrance and adjoining doors (e.g. key for all commercial clerks).
2SMK 2:	This submaster opens main entrance, adjoining rooms and secretary doors (key for secretary of Messrs. Berger.