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deadbolt
A eadbolt or deadlock, is a special kind of locking mechanism, providing more security than an ordinary key-operated lock because the weight of the locking bar is usually sufficient to increase break-in time to 10 or 15 minutes.
Trivia about deadbolt
It's a type of lock that has no spring
Keep bad men outside with this, defined as a bolt operated by key or knob without spring action