Designed for discreet reinforcement, the PM444 series Security Door Bolt from Yale is concealed within the door (mortice fixed) and secures by throwing a bolt into the door frame. Operated with the supplied key, it provides an added layer of security for everyday home use, helping to strengthen a door’s resistance when closed. Neatly hidden from view once fitted, this style of door bolt is well suited to customers who prefer a more unobtrusive security solution, while still benefiting from key operation for controlled access. Key features Concealed, mortice-fixed security door bolt Bolt throws into the door frame for secure closure Key operated Key supplied Model number: PM444 Please note: Colours shown are as accurate as possible, though may vary slightly depending on your screen settings.