Bump keys, like lock picks, are a tool locksmiths use to open a lock without a key. To use a bump key, a locksmith inserts a bump key into a lock, pulls the bump key out by the length of one pin and then strikes the base of the key with a bump hammer while maintaining rotational pressure on the key. Just like lock picking, the bumping action lift all the locks driver pins above the shear line allowing a locksmith to turn the lock open.
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