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The Master Lock NightWatch® deadbolt is the ONLY deadbolt that prevents an intruder from entering your home… even if they have your key.

  • When the NightWatch® feature is engaged, the lock cannot be opened from the outside. Even with a duplicate key.
  • Can only be engaged or disengaged from inside the home.
  • Fits all doors — replaces all brands.
  • All NightWatch® deadbolts feature the exclusive Master Lock BumpStop™ Advanced Cylinder Technology to resist bump attacks.

Watch video for more information and demonstration.

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