How do master keys work?

Question

How come Key A can open Lock A. Key B can open Lock B. But not lock A. And key C can open all the locks? Doesn’t that mean A and B should be able to open each other?

In: 731

Answer 1

Inside of a lock are little pins that the key pushes up. These pins come in a bunch of different lengths.

When they are pushed to the right height the lock will open.

Mastered locks/keys have 2 arrangements in which the keys will open the lock (because they use different lengths of pins which allows for multiple combinations).