A wrench comprising: a handle and a head connected to an end of the handle and a first jaw and a second jaw extending from the head, the first jaw having a first inclined surface defined in a first side thereof and the second jaw having a second inclined surface defined in a first side thereof, the first inclined surface and the second inclined surface respectively tapered toward two respective distal ends of the first and second jaws defining respective tilt angles relative to a horizontal plane, the tilt angle relative to the horizontal plane of the first inclined surface is different from the tilt angle relative the horizontal plane of the second inclined surface, so that a thickness of the distal end of the first jaw is smaller than a thickness of the distal end of the second jaw. view more