They carry one key and can access everything.
Door hardware master key system.
In master ring they can.
This security enhancement reduces the chances of cylinders being manipulated by stray keys.
Every deadbolt every door every padlock every storage location everything.
Each one operates only one lock or one group of keyed alike locks.
Master key the master key is able to lock and unlock all of the change key locks prioritized below it within a given system.
The more powerful key at the top is called the master key.
This frees thousands of combinations for use anywhere within a master ring system.
The simplest master key system has two levels of keying and is considered the lowest level of master keying.
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The change key s corresponding lock can also be opened by the master key.
Change key also referred to as a sub master key this key will open only one lock.
Since the master keys all have their own shear line fewer master pins are used increasing cylinder security.
Then moving down in seniority department heads can have one key that works every door in just their department.
The less powerful keys at the bottom are called change keys.