These locks are available with deadbolts, latches or a combination of both (when they’re called sashlocks) and hook and claw bolts that are used for sliding doors. Below are some examples of typical mortice locks found up and down the UK.

They are fitted inside a lock pocket or a mortice cut out of the door. They are very common and the chances are at least half of you will have them in one or more of your doors. They are available in two different sizes to suit the width of the door stile into which they are fitted and are operated either by a cylinder key or levered key.