ERA BS 3621 Maximum Security Nightlatches are recommended for external timber or composite doors. The BS 3621 standard is recognised as giving the maximum protection for home and commercial use, approved by Insurance companies and the Police. Integral Cylinder housing/pull protects the cylinder from drill attacks. The cylinder has over 30,000 key variations and is constructed with anti Lockpick pins. The Nightlatch bolt has a 20mm throw for greater security and strength. The bolt automatically deadlocks when the door is shut to prevent credit card attacks. The generously sized internal, easy to use handle, can be locked which prevents the lock being operated when a winow pane is broken. The lock is opened from the outside via a key and by a handle on the inside. Lock can be held open by using the snib button on the internal side of the door to prevent accidentaly being locked out. ERA Locks have been providing high quality home and business security products for over 150 years. ERA is one of the UK’s most recognised Lock brands providing you with the peace of mind that your property and possesions are locked up safe and sound. ERA Locks are approved by Insurance companies. The extensive range of products includes, Nightlatches, Mortice Locks, Window Locks, Cylinders, UPVC and Composite door locks, Digital Door Locks & Wordlock Padlocks.