Yale 89 Deadlocking 60mm Nightlatch

High Security Double Locking Nightlatch with deadlock function from the outside using a reverse turn of the key. • Snib to deadlock or hold back the latch deadlocked by the snib button internally • Supplied with an anti bump 1109 rim cylinder and 2 keys • 2 Years manufacturer's warranty Inside handle can be deadlocked by a reverse turn of the key in the outside cylinder after closing the door