The CL620 is a heavy duty tubular Mortice lock with double cylinder, 3 keys and anti-panic safety function. The outside lever handle will retract the latch after a correct code is entered. The spring loaded latchbolt will lock automatically when the door is closed. The key retracts the latchbolt for entry without using a code. The key controls the deadbolt position. When the deadbolt is projected it denies access by code. When the deadbolt is projected the safety feature allows the inside lever handle to retract the deadbolt and the latchbolt, preventing people being accidentally lock in. The key can be used to open the doors for management functions such as security and cleaning.