The pair of pliers includes a handle unit 1, a head unit 2 and at least one positioning unit 3. The handle unit includes two intersecting handles 11 pivotally connected with each other. Each handle includes a mounting portion 12 which is provided with a mounting slot 13 and a regulating hole 14. The head unit includes two heads 21 arranged symmetrically. Each head is provided with a working portion 24, a pivot hole 22 and positioning grooves 23. Each of the heads is pivotally mounted in the mounting slot by the pivot hole. Each of the positioning grooves is moved by rotation of each of the heads to align with the regulating hole. The at least one positioning unit is mounted in the regulating hole of one of the handles and locked in one of the positioning grooves of one of the two heads. The positioning member may be biased by an elastic member and may be spherical in shape. The regulating hole of each handle may be screw threaded.
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