Super quality iron, surface dusting technology, durable. User friendly, and easy to install. Suitable for all sorts of access control systems and Video door systems. Suitable for home, offices, schools, hotels, factories, warehouses, etc. Fit both Left and Right hand door (by rotating the lock 180 Degree). Support manual unlocking, 3 keys included. Unit has two wires running from it for electronic access. High anti-theft and high safety. NO (open when powered) Fail Secure Operating Mode. With electronic-control unlocking unit and a spring adjusting balance unit.