A Deadlocking Nightlatch offers the same level of security as the standard nightlatch but comes with the added "double locking" feature, by which the latch can be deadlocked by key from the outside. Although this type of Nightlatch certainly adds a certain amount of increased security, it might not be right for your purposes and should not be used in multiple occupany dwellings. For more information about the of Deadlocking Nightlatches, please see Night Latches - Deadlocking vs Non-Deadlocking.
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