Abstract: A wrench includes a handle having a gear and a pin hole and having a fixed jaw having a toothed face, a movable jaw having a first end provided with a gear and a pin hole and a second end provided with two toothed faces, two clamping plates rested on the handle and the movable jaw respectively, and two pins extended through the clamping plates respectively, and extended through the pin hole of the handle and the pin hole of the movable jaw respectively. Thus, the corresponding position of the gear of the handle and the gear of the movable jaw can be adjusted to regulate the size of the clamping space rapidly, so that the wrench is used to rotate workpieces of different sizes.

Abstract: A tool includes a pair of levers having a middle portion pivotally coupled together and having a handle formed on one end and a bar formed on the other end. The bars each have a cavity. A pair of jaws each has a stud for engaging with the cavity of the bar and for allowing the jaws to be secured to and disengaged from the bars. One of the jaws includes a jut or a pin or a protrusion for engaging with the recess or the cavity or the aperture of the other jaw and for forming various kinds of pliers. The jaws each includes a knurled surface for forming a pair of pliers.