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Functions similarly to a standard Yale type surface nightlatch
It swings locked as it has a spring bolt and is opened by either key from outside or by a thumbturn from inside
There is a holdback snib on the forend
It's the swing locked function that makes it so useful, for instance, on main entrance doors to blocks of flats or office buildings where the occupant opens the lock by key, passes through, then, providing the door is fitted with a closer, the door will swing locked behind them
This nightlatch is widely used with an electric strike as part of an access control system
To the inside you would normally see the nightlatch operated by the thumbturn shown above or a half set of lever furniture that gives easier to operate egress