This UHPPOTE Electric Strike Door Lock Fail-Safe is the perfect solution for access control systems. It offers fail-safe operation, so when power is lost, the strike opens the door. It is designed to fit most metal or wooden doors with minimal cutting required of the door frame beyond the hole for the strike. It provides 1,000-pound holding force/static strength and is a solenoid with one function, which can be wired any way with two contacts and no polarity requirement. This lock will polarized when the diode is added. It is the perfect choice for any access control system.