Abstract: To provide added security to the hinged edges of all residential and other doors. A two piece device of metal or plastic and all combinations thereof, resembling hinge leaves (1)(12) that are intended to be attached to the door post and the hinged edge of all doors and where one of the pieces (1) is fitted with pin extensions (2) that interlock with slots or holes (11) in the mating piece (12) when the door is in the closed position. The locking pins (2) may be cylindrical or tapered and may be attached to the plate (1) by welding, forging or pressing. The locking pins (2) may be solid or fitted with rotating external sleeves (8) or internal rods which may be secured onto and into the locking pins (2) by all simple mechanical means. Each half of the device is attached to the door frame and the hinged edge of the door by two or more countersunk screws.