| 摘要 |
The invention relates to hand tools and to threaded fasteners, and comprises a screw and corresponding screwdriver. The screw comprises a head and a threaded working end. The head slot for inserting the screwdriver is made in the form of a “dove tail.” The working section of the screwdriver for screwing and unscrewing the screw is made as a mirror image of the screw head slot, with the same angle of slope. The invention lengthens the life of screwdrivers and screws and their serviceability. |
