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. Restricted security key blanks of a master key are patent protected disabling other key manufacturers create duplicates of that design.

Master keys are often used by apartment proprietors whereby they are able to obtain access to each doorway of these rented rooms/flats, and each occupant possess their own keys for a specific unit as well. That very same key may additionally open the main door to their building or any other common areas. However, it cannot be used to open another apartment, unlike master keys.

Master key system is a complex system that involves grand master and sub-master keys. If you want to have one key to all different doors, then a master key is what you need.

We can make the proper master key systems depending on your key holder. Calling us would be the best thing you should do when in lock trouble. Reach us through our number and we'll provide answers anytime. Our customer support is available 247.