Abstract: A screw driver structure includes a shank and a compression ring. The compression ring houses a compression spring which is tightly coupled on the shank to allow the compression ring to move relative to the shank. When the shank is turned to drive a screwing element, the compression ring may be adjusted according to the position of the screwing element so that the compression ring can compress the coupling surface of the screwing element to give the entire coupling surface a vertical and downward action force to prevent the screwing element from wobbling sideward and enable users to fasten the screwing element single-handed.

Abstract: A hand tool provides two operative modes for user selection. The hand tool includes a movable handle which may be turned to a first operative position axially aligned with the shank or be turned normal to the shank at a second operative position so that users may select different handle positions to meet different needs.