Abstract: A wrench includes a main body, an engaging member, a direction setting plate, beads, several twin holes on the setting plate, and rolling elements; the engaging member has spaced external protruding portions, and concavities between every two adjacent protruding portions; the setting plate has spaced protrusions equidistant from the center; the beads are fitted on and biased away from the engaging member and pressed against the setting plate, and each fitted on one of corresponding twin holes; the rolling elements are respectively positioned in the spaces between every two adjacent protrusions; the main body will cause the engaging member to turn when each bead is fitted on a first one of corresponding twin holes, and when it is turned in an active direction; the main body won't cause the engaging member to turn together with it when it is turned in an inactive direction opposite to the active one.

Abstract: A leverage wrench includes a frame seat having a guide seat which is provided with a position-confining hole. The guide seat is pivoted with two inner support plates such that a guide bolt of the inner support plates is received in the position-confining hole. The frame seat is pivoted with two outer support plates which are in turn pivoted with the inner support plates. The inner support plates are jointly fastened to a movable lever. The outer support plates are jointly fastened to a fixed handle.

Abstract: A leverage wrench comprises a frame seat having a guide seat which is provided with a position-confining hole. The guide seat is pivoted with two inner support plates such that a guide bolt of the inner support plates is received in the position-confining hole. The frame seat is pivoted with two outer support plates which are in turn pivoted with the inner support plates. The inner support plates are jointly fastened with a movable lever. The outer support plates are jointly fastened with a fixed handle.