Abstract: An improved screwdriver comprises a hollow cylinder having a plurality of guiding slots therein, each guiding slot receiving a slidable connecting piece having one end connected to a driver bit; a hollow guiding cylinder having a plurality of sliding slots therein is connected to one end of the hollow cylinder, the sliding slots corresponding to the guiding slots in the hollow cylinder for receiving the driver bits; a positioning head is connected to the other end of the hollow guiding cylinder and has an exit end with a hole of the size of the driver bits; a hollow sealing cover is connected to the other end of the hollow cylinder; and an actuator rod is slidably mounted within the sealing cover, and a peg is provided at the center of the actuating rod.