Pacific Doorware Brand , Use on models Detex EA500 , EAX-500 , EAX300 , V40 EB , EA2500 , EAX2500 Part number 102281-7 , MC65 , For Arming & Disarming Detex Exit Alarm Devices Solid Brass Key Lock Cylinder Includes 2 Keys (SC1) For Detox battery powered operated surface wall or door mount exit alarms Lock Cylinder & keys only, for use with Detex Battery Powered Door or Wall Mount Exit Alarm, 2.10" W x 2.375" D x 7.70" L , fits detox eax-500w eax-500 eax-2500 EA-500 , EAX-500 , EAX-300 , V40EB , EA-2500 , EAX-2500