The Yale range of mortice locks that meet all applications and security needs. A mortice lock is set inside the door itself to ensure a flush finish rather than being surface mounted. A mortice lock is best suited to work with wooden doors and they are available in different sizes, colours and finishes. There are several versions of mortice lock to choose from including 2 lever, 3 lever or 5 lever. The greater number of levers in the lock the more secure your door will become. The most secure 5 lever mortice lock is one which is Kitemarked to British Standard BS 3621.