English: A padlock skeleton key with all of the teeth filed down (right) and a normal key (left) for the same lock. The normal key on the left will open only the lock that it goes to, but the skeleton key on the right will open any lock with this particular keyhole.
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Captions
A padlock skeleton key with all of the teeth filed down (right) and a normal key (left) for the same lock. The normal key will open only the lock that it goes to, but the skeleton key will open any lock with this particular keyhole.