| 摘要 |
A screwdriver contains a front part including a connector and a number of ribs, between each two ribs being defined a chamber; a middle part including a central block and a plurality of extending wings, the central block including an orifice, each extending wing including a slot; a rear part including a cover, a shaft, and a plurality of pegs; a plurality of seats axially connected between the two extending wings and the two pegs and located at the chamber of the front part, and each seat being moved between a storing position and an operating position by an external force; a number of bits, each including one end to be inserted into the seat when the screwdriver is operated, the seat is moved toward an operating positions so that another end of the seats extends out of the chamber of the front part to take out a desired bit.
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