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. Locks are safer because the restricted keyway decreases the possibility of the accidental opening using the incorrect key.

Apartment owners uses master keys to open each door of their rented apartments, then occupants have their keys for their unit being rented. That same key may also open the main door into their building or other common areas. But it cannot open other units, unlike master keys.

Complex master key systems involve multiple master keys, grand master and sub-master keys. Master key system is all you need when you want to possess only one key to access all doors in your home or commercial building.

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. Our customer support is available 247.