From Yale Locks, the PM444 Door Security Bolt is designed to add an extra layer of security to your door. Concealed within the door as a mortice-fixed bolt, it offers a discreet finish while helping to reinforce the door against unwanted entry. Once fitted, the bolt throws into the door frame and is operated using the supplied key, providing keyed access for added protection around the home. A practical choice for those looking to enhance door security without a visible surface-mounted fitting. Key features - Concealed, mortice-fixed security door bolt - Bolt throws into the door frame - Key-operated design - Key supplied - Model number: PM444