SDC key switch assemblies provide an economical method of providing authorized control for a variety of applications. A choice of several contact configurations ensures compatibility with virtually any system. Key switch assemblies are compatible with U.S. standard, 1" to 13/8" mortise key cylinders and interchangeable core cylinders (not included). Compatibility with a new or existing facility mechanical key system is maintained. SDC's 700 series switch assemblies come standard with stainless steel faceplates and heavy duty rated switches. Available in a narrow faceplate size to mount directly to the door frame or single gang and double gang sizes to be box mounted.