Adjustable opening pliers

Adjustable opening pliers, comprising:

• a passive male shank, comprising consecutively, a first handle, a first intermediate sector and a first jaw, where in the first intermediate sector a longitudinal through slot is located, with teeth defined on its lower internal edge;
• an active female shank, comprising consecutively a second handle, a second intermediate sector and a second jaw, where the second intermediate sector has a transverse through channel, for partial insertion of the male shank, and a perpendicular and through side bore, which passes through the female shank at the end of the transverse channel closest to the second jaw;
• and
• an adjustment mechanism insertable at least partially into the side bore,
• for adjustable mutual linkage between the male shank and the female shank;
• the pliers being characterized in that the adjustment mechanism comprises:
• a ratchet, which can be engaged and disengaged with the teeth and is provided with a central through hole;
• and
• a shaft attachable in the side bore and actuatable by rotating the female shank, with a stem configured to interact with the internal surfaces of the central hole of the ratchet;
• in which with a turn of the female shank the shaft stem interacts with the internal surfaces of the central hole of the ratchet so that it turns in connection with the shaft to disengage the teeth and subsequently adjust the relative mutual position of the male shank and the female shank.