Overhead - sets (imposed) on the inside of the door, a mechanism secrets hit the flat part of the door. They are easier to install, compared with inset hardly diminish the strength of the field (recommended for wooden doors), and especially well on the doors opened inwards.

They can not lock in place inside the key, but by turning vertushki. Invoice lock difficult to criminal autopsies, as it further than inset, located on the outer surface of the door. Sometimes overhead, and locks used on steel doors, in addition to the existing inset.

disadvantage of overhead locks is deteriorating appearance doors

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