Use the key in the kit as the master key.
Master key for all door locks.
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Master key systems often use pin tumbler locks.
The drawbacks are that anyone with a key will have access to your entire home and all of the locks will need to be rekeyed if a key is lost.
Once you have weighed the pros and cons and decided whether or not you want to have all of the locks in your house keyed alike call all american locksmiths.
The headmaster would have a key to all 200 locks and the caretaker would have a key to 199 locks to exclude the headmasters office.
At the same time more than one key can open the same lock.
To allow for entry using your original and master keys change the pins in the lock mechanisms in each door.
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Master key system is a system that allows two or more keys to open one lock.
This option provides same key convenience and eliminates the need for multiple keys where numerous door locks are used.
Comes in a variety of lengths to suit your needs and is compatible with the full range of adapta j40 cylinders.
Kwikset makes a rekeying kit that includes all the parts and tools you need to create a master key.
The head of the science department.
In short a master key system allows one keys to open multiple different locks.
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Pin tumbler master locks use a master wafer pin in between the key pin and the driver pin.
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Keyed different is the standard keying default on master lock and american lock door locks.
You might then have the science building with 40 locks.