The Detex DT-011 Detex Key Cover Lock is a security accessory designed to protect key cylinders on Detex exit control locks, specifically the ECL405 model. It's a protective cover that prevents unauthorized access to the key cylinder, deterring tampering and ensuring the lock remains secure. This adds an extra layer of security to access control systems. https://partsfe.com/dt-011-detex-key-cvr-lk-detex-ecl405-dt011