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ScrewTight mortise door lock, also known as a mortise lock, is a type of lock that is installed within the body of a door. It is commonly used in residential, commercial, and institutional buildings for security purposes. The lock cylinder is the part of the mortise lock that accepts the key. In a double-cylinder lock, a key is required to operate the lock from both sides. It's worth noting that the installation of a mortise lock usually requires professional expertise as it involves creating a mortise pocket within the door and accurately fitting the lock components. If you're considering installing or replacing a mortise door lock, it's recommended to consult a locksmith or a professional installer who can ensure proper installation and functionality.