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Reliance D31 double door twin deadbolt multipoint lock, LH, 45mm backset, 12mm latchplate, c/w top and bottom shootbolts for slave door only for 1891 - 1964mm high doors
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Amazon.com: Upgrade Sliding Glass Door Lock: 2 Pack Child Proof Window Locks Vertical Install on The Top Bottom of Doors as Slide Door Security Bar Keep Home Safety, Foot Adjustable Kick Lock
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A-Series Hinged Door Active Panel 3-Point Lock Mechanism 9014688 A-Series Hinged Patio Door Hardware
What kind of door lock can be locked from both sides but when it is locked from the interior it cannot be unlocked from the exterior? - Quora
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