60MM, HIGH SECURITY, GREY COLOUR
A nightlatch is operated by a key from the outside or a handle on the inside and immediately locks the door, to prevent the door being left unlocked.
Nightlatches also have an internal button to deadlock the door, this type of lock is often referred to as a Yale Lock.
Some Yale locks can be double-locked. Instead of just pulling the door shut behind you, you can turn the key to lock it. This effectively turns the Yale into a sort of deadlock.
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