Abstract: The rotary wrist motion hand tool of the present invention includes a grip member having an insert and a bit holder having an attachment member. The attachment member has one end formed by two opposed prongs with a recess between the prongs for slidingly receiving one end of the insert. Both prongs have apertures through their centers which are aligned with a hole in the insert. The insert and the attachment member are rotatably attached by passing a pin through the apertures of the prongs and the hole of the insert. In circumstances requiring high torque, the operator may manually rotate the grip member of the hand tool ninety degrees so that the longitudinal axes of the insert and the attachment member are perpendicular.