Mortice Dead Locks can only be operated with a key. Dead Locks have a single bolt that secures into the door frame and offers extra strength. Dead locks offer exceptional security and are specified by many insurance companies.
If your insurance company requires you to fit a deadlock, make sure that what you're fitting complies with their criteria - they will usually state the need for a British Standard approved lock. We have locks meeting the relevant British Standards in the range below, and will be happy to help find the right lock for you if you've got any questions about the standards and what they mean for you.