Graphical Construction Glossary >> Doors. >> Door Hardware >> Key System
As mentioned in the previous page lock manufacturers or locksmiths can provide Construction Cylinders to builders and developers that are used in the building until just before hand over to the clients. These construction cylinders are normally keyed alike.
Keyed to Differ. This system is the standard one for locks sold over the counter at retail outlets. It is a basic one where every key is different and a key is needed for every lock
Keyed Alike means that every lock can be opened with one key. This is a particular favourite for private homes. A single key may be able to open any number of entrance doors.
Master Key In an area that has been keyed to differ a masterkey will open ever lock.
Maison Key These keying options are used in apartment blocks and office building and the like. Each apartment will be keyed to differ, but those same keys will be able to unlock communal doors like gates, garages and storerooms.
Grand Master Key An extension of the master key system where groups can have master keys and the grand master key can open every one.
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