Screwdriver, has switching unit rotatable in order to selectively insert contact region from one of pairs of contact units in contact with tooth of body, so as to control relative rotation between two bodies

摘要

The screwdriver (10) has a body (20) with two ends, and another body (30) with two ends. One end of the body (30) is rotatably assembled at one end of the body (20). Two pairs of contact units are movably accommodated in a transverse-accommodating section, where each contact unit has an end with a contact region. A switching unit (50) is rotatably assembled at the body (20). The unit (50) is rotatable in order to selectively insert the contact region from one of the pairs of contact units in contact with tooth of the body (30), so as to control a relative rotation between the bodies.