Screw device for adjustable interconnecting two elements, such as a wall and a door frame, comprising a screw member to be screwed into one of the elements having a head portion adapted to be engaged by a wrench or similar tool and an externally screw threaded tubular nut member to be screwed into the other element, and which rotatably surrounds the head portion while being maintained against axial displacement, the nut member having a socket for receiving the head portion in spaced relationship to provide access for a tool to selectively rotate the screwhead and the nut for adjustment of the spacing between the elements and to lock the screwhead and the nut against relative movement.