SDC key switch assemblies provide an economical method of authorized control for a variety of applications. A choice of several contact configurations ensure compatibility with virtually any system. Key switch assemblies are compatible with U.S. standard, 1" and 13/8" mortise key cylinders and interchangeable core cylinders. Compatibility with a new or existing facility mechanical key system is maintained. SDC's 800AL series vandal resistant switch assemblies come standard with 1/4" thick aluminum faceplates and heavy duty rated switches. Available in a narrrow faceplate size to mount directly to the door frame or single gang sizes to be box mounted.