This Device is ideal for installation where Two distinct circuits must be Switched by a single key. Each circuit can be wired N\O or N\C and Two extra terminals are provided for wiring the Internal Tamper Switch. The Internals are housed in a heavy Duty Aluminium casing. The lock has Two distinct positions and does not spring back when released. The key can be removed in either position & Two keys are suppled with each Unit. All Units are keyed alike.