A master keyed lock is actually a lock that's built to be opened up by specific keys, but could also be opened using a master key. 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. That same key may also open the main door into their building or other common areas. Unlike Master keys, a tenant's specific key will not work on the lock of a different apartment unit.

Master key systems also involve 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.

We can make the proper master key systems depending on your key holder. When in an urgent locksmith emergency trouble, make sure to call our locksmiths at our emergency hotline number. We are available 247 to answer you calls.