A deadlatch will self-latch when the door is closed, unlike a deadbolt which must first be extended. It also cannot be opened by end pressure against the latch when the door is closed, but may be retracted by either the knob/lever or key.
The 127 mm backset of this deadlatch is ideal in situations where the stile may cause difficulty in using a knobset with the standard 60 mm - 70 mm backset.
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