ERA Replacement Front Door Lock are recommended for timber or composite doors. The lock can be Deadlocked via an extra turn of the cylinder which prevents the lock being operated via the internal handle when a window is broken into. Lock can be held open by using the snib button on the internal side of the door to prevent accidentaly being locked out. The snib button is also used to lock the mechanism at night. Generously sized internal handle for ease of use. The lock is opened from the outside via a key and by a handle on the inside. 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.