Air automatic screw feeding unit with automatic screwing via push clutch. The machine stops automatically after screwing and uses foot pedal control for error free operation. It includes a safety switch against misuse, special screw height adjustment, automatic profile clamping during screwing, and adjustable supported profile distance. Bit usage is long lasting with easy replacement, and torque can be adjusted according to screw type. Average screwing speed is approximately 1.5 sec per piece.