Screwdriving apparatus for use in driving screws joined together in a strip.

(57) The screw driver for clamp implements constituted so that the screw with which summary diameters differ might be screwed in, especially an electric screw driver are described. The electric screw driver of the present invention is equipped with the guidance tube which can be removed, and the complementary screw shaft. This guidance tube is a size of the diameter of the screw of one size. The screw shaft which can remove that it is complementary and is a size guided into a guidance tube, and both-way movement of it can be carried out within a guidance tube, and engaging of clutch is carried out to the screw arranged in a guidance tube, and it guides the screw. By demounting one pair of guidance tubes, and a complementary screw shaft, and exchanging with the guidance tube and complementary screw shaft which were constituted so that it might be used for the screw with which the diameters of one another pair of heads subsequently differ, The screw driver of the present invention is adapted so that the screw with which it passes and the diameters of ッド differ may be screwed in.