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Two-thirds of U.S. homeowners have unknowingly exposed themselves to the risk of an intruder entering their home with a copy of their key. Every time a homeowner lends out a key to a contractor or babysitter, or uses valet parking at a restaurant or hotel, or if they or a family member loses a key, there is a chance that their key could be duplicated and circulated to people they don't know without their knowledge.NightWatch™ deadbolts were specifically created by Master Lock Company to prevent an intruder from entering, even if they have a copy of the homeowners key. Each installs and functions like a standard deadbolt, but once the exclusive NightWatch™ feature is activated, all keys are blocked from unlocking the deadbolt.With NightWatch™ deadbolts on their doors, homeowners will enjoy the peace of mind that comes from knowing that unaccounted for keys are rendered harmless.Master Lock Grade 3 Residential Door Hardware provides a quality, cost effective choice for your door hardware needs. It is a dependable replacement for any brand of door hardware. Nightwatch™When the NightWatch feature is active, the lock cannot be opened from the outside. Even with a duplicate keyCan only be engaged or disengaged from inside the homeExceeds ANSI Grade 2 specificationsFits all doors; replaces all brandsLimited Lifetime Finish and Mechanical GuaranteeAll NightWatch deadbolts feature exclusive Master Lock Bumpstop™ Advanced Cylinder Technology to resist bump attacks