The invention relates to a device for screwing in fastening elements that consist of a plastic retainer (13) and a premounted screw (11). The inventive device is further characterized by a screw device (6) and a screwdriver (5). The screw device (6) comprises two tubular elements (58, 59) that are coaxially inserted one into the other. The extent to which they engage with each other can be adjusted and the tubular elements (58, 59) can be interlocked in the adjusted position. The tubular element (58) is further provided with a stop element (62) comprising a stop boss (63') which interacts with a stop screw (63).