Mortice deadlocks are normally found on the lower part of your door a few feet below your rim cylinder. Most commonly known as a 'Chubb' lock, mortice deadlocks have a wide range of different manufacturers. Mortice deadlocks are mortice'd Into the door and a solid bolt Is thrown Into a keep by turning the key. Operated by levers or detainer's mortice deadlocks offer a high security solution to act against burglary. easylocks are the UK's main supplier for mortice deadlocks.