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.