There are two main types of padlocks: combination locks and key locks. Combination locks can be opened with a rotating combination dial, while key locks require a key. Padlocks that use keys can be key-retaining, meaning the key can't be removed while the lock is open, or non-key-retaining, meaning the lock can be removed while the lock is open.. A skeleton key is a simple iron or steel tool with wards that allows one to open many locks of different types. Though outdated, the term can be used to refer to a key that opens any lock. Blank Key. Blank keys come in assorted sizes and are usually used for home security purposes like adding deadbolts to protect windows or doors without.

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A key that can open many locks is considered a master key
And keys that open many locks aren't inherently better than keys that open one lock, especially since keys that open many locks usually require the use of force and assistance to open locks because the key-lock relationship wasn't designed for keys that can open many locks.. Cylinder - The central part of the lock, often referred to as the cylinder core, contains the keyway and the pins or tumblers that interact with the key;; Key - The key is designed with unique cuts and ridges that match the pins inside the cylinder. When the correct key is inserted into the keyway and turned, it aligns the pins at the shear line, allowing the lock to turn and open.