Masker keys are keys that are designed to open different locks even if they are not keyed the same. A Master Key System includes a hierarchy of keys along with a variety of cylinders or locks that let different or individual key holder gain access to any given parts of a building or buildings.

Master keys are usually being used by apartment owners where they can open each door of their rented rooms/flats, where renters also have their keys for their particular apartment. Tenants's key may also be used to access the main door of the building along with other areas accessible to renters. However, it does not have the ability to access all doors in the entire apartment unlike master keys.

Master key system is also a complex system as it may involve multiple master, grand master, and sub master keys. You need a master key if you do not want to keep a lot of keys for a lot of doors.

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