Abstract: A pipe wrench includes a handle, a seat pivotally fixed at the front end of the handle by a ratchet wheel, and a head slidable in said seat. A pawl with two teeth is pivotally fixed between the ratchet wheel and the handle so that the teeth of the pawl are engagable with the ratchet wheel. A rack is formed on the lower surface of the head for engaging with the ratchet wheel so that the head can be extended or retracted by the rotation of the ratchet wheel or by the rocking of the handle relative to the seat and the head. A spring is fixed at one end to one end of the slot and at the other end to the seat.