Abstract: A screw nail having a nail head with rounded peripheral portions alternatingly arranged with vertically cut external recesses. Gyration power for insertion or removal of the screw nail from a target surface is transmitted to the screw through the recesses using a suitable driving device. A groove in the flat upper surface of the nail head is of auxiliary use for transmitting rotational force, but is of insufficient depth to drive the screw nail into a surface independently of the recesses. By driving the screw nail using the external grooves, the requirement for alignment with the driving device is reduced and, because the nail heads can be thinner, the screw nails may be more inexpensively produced.

Abstract: The system generally comprises a nail that engages an assembled screw driving apparatus. The apparatus is typically stored in a ready position and moved to the load position in order to affix the nail to the apparatus. In the ready position, a top section of the bit extends beyond the end of the cylinder. The nail can now be easily fitted with the top section of the screw bit. The nail is fitted with the screw bit, and depressed into the apparatus. The apparatus automatically enters a drill position, in which the nail is locked to the apparatus and drilling begins. The nail will be released from the apparatus at a certain distance from the substrate. The nail is further rotated to drill the nail to a predetermined depth in the substrate. Once screwing is complete, the apparatus is removed from the nail and the apparatus automatically returns to the ready position.