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Yale has a comprehensive range of nighlatches suitable for all applications and security needs, including locks that meet BS3621 & BS 8621. 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. A nightlatch door locks are typically fitted to wooden doors.