For access control and emergency; a master key to fit all pertinent locks in a building and is usually kept in the main office or held by the manager. Tenants will be given keys to access their individual units within the building. As for an enterprise, keys are given to employees according to their access level.
You may like the key alike system which is great for convenience. One key is all you need to access your main door, gate and mailbox. This saves you the hassle of sorting through your keys for the right one and not having to carry a bunch of keys.
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