This UHPPOTE ANSI Standard Heavy Duty Electric Strike Lock Fail Secure is designed for door access control systems with mortise or cylindrical locksets. It features a fail secure, NO mode (locked when power is removed) and a 4-27/32" faceplate. It can accommodate up to 3/4" latchbolt projection without deadbolt and is designed for metal frame doors. Installation is easy - just drill a hole and install it directly. Before purchasing, please check the size of your door's frame to ensure the correct fit. This electric strike lock is perfect for those looking for a reliable and secure access control system.