Each 2500 Series Electromagnetic Lock is comprised of 3 basic components: a lock housing, an electromagnetic coil, and an armature. The coil and housing assembly mounts rigidly to the door frame while the armature mounts to the door in a manner that allows it to pivot slightly to compensate for door irregularities. When the door is closed and the lock is energized the armature is magnetically bonded to the lock face, thus securing the door without utilizing any moving parts. Single and double door models are available as well as the 2585 Series, which has a shorter housing. At only 8 1/2″ long, the 2585 “Bantam” lock is perfect for installations where space is limited. All locks are designed for ease of use, and built in the USA to last a lifetime.