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Designed to add a top-of-door third locking point for pairs of doors with an MS
pivoted bolt deadlock and 4015 threshold bolt in the active leaf. This additional
bolt triggered by the pivoted MS bolt expands in a "scissors" action to center
itself in its strike as it rises. This action saves the key holder from the
difficulty of lining up the doors with three separate strikes, even if doors
are misaligned due to faulty installation or settling. The 3 point features
may be added to any basic MS1851S, MS1851 or MS1851SNSI deadlock.
02 = tall door height (120")
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