Explaination Of Keyed Alike	Explaination Of Keyed Different
Basically "keyed Alike" means that locks in a set or ‘suite’ have the same key code, ie. any key fits any lock. This is convenient where a large number of locks are to be used by the same group of people or person.	This means that all locks have different key combinations, ie. a key from one lock will not fit any other lock in the same group, there is usually a limit to the total number of differs available for a particular lock group but is generally high and not normally a problem for most applications.

Explaination Of Master Key

As used suits of locks where one ‘master’ key can open all the locks in a suite, which are themselves made to different key combinations i.e. keyed to differ.