BS 3621:2007 Double Locking Nightlatch - 40mm Backset - Polished Brass Case/Cylinder - Zinc

This British Standard high security nightlatch complies with BS3621:2007 and falls in line with the new European Standard (BS EN 12209)
Features an integral cylinder pull which protects the cylinder from being drilled
Includes 20mm bolt throw for extra strength and security
This product is ideally suited to glass panelled wooden doors
It's designed with an internal lockable handle, offering added security against forced entry
Operation is by key from the outside and by handle from the inside
Cannot be forced with a credit card - main lock bolt automatically deadlocks
The bolt can be held in the withdrawn position only with the use of the snib feature
Backset is the measurement from the edge of the door to the centre of the keyway