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ONMAX Stainless Steel Mortise Handle, K.Y. 8 inch Mortise Door Lock in S.S. Finish .Mortise Pair with Double Turn Lock (3 Keys) Two Sided Key Lock Set(HML6+SS803S) (Set of 1) - Price History
Why do door locks have two turns for locking, turn once-locked, turn twice-superlocked? What's the difference, and if one is more secure than the other, then why are there options? - Quora
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Multipoint Door Lock Set For External Timber / Wooden Double Doors 44mm To 57mm Thick - Lift Handle To Lock Operation | G Johns & Sons
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