Especially designed to make small ring-shaped cuts in the branches of kiwi trees, so that knots will form above the zone where the fruits grow making it difficult for the sap to rise, thereby causing greater quantities of nutrients to reach the fruits, the structure being basically similar to that of a pair of conventional pliers, being equipped with two arms (1) and (2) articulated (3) that form a gripping device (6), but with the characteristic feature that each one of the arms of gripping device (6) is provided with two pairs of circular blades (7), lying very close to each other, so that when the pair of pliers is clamped onto the branch of the kiwi tree and partially rotated, they make a ring-shaped cut in the bark on the branch, without affecting the wood, as the aforementioned arms of the gripping device (6) are equipped with inner buffers (10) that limit the depth to which the blades (7) can penetrate. A clean and fully effective cut is thus guaranteed, without the user being exposed to any risk.