Asec  Traditional Non-Deadlocking Nightlatches - No Cylinder 

The latch bolt is withdrawn by lever from inside and key outside (cylinder available separately).

Latch and knob cannot be deadlocked by key, therefore are suitable for unglazed emergency escape routes eg flats

Latch can be retained in lock case (on latch) by slide button.

Latch bolt hand can easily reversible on site if required (for outward opening doors). 

Includes geen finish lock case, striker plate and fixing screws
Backset: (Distance from door edge to cylinder centre) :  40mm or 60mm