A tool (1) for insertion into trees comprises a first proximal end (3), a second distal end (4) and a body (2) axially extended between the first and second ends (3,4), wherein the second distal end (4) is of the cuneiform type provided with a linear edge (6) to promote the insertion of the tool (1) into a tree trunk (A), the edge being (6) linearly extended in a direction almost orthogonal to a longitudinal axis (Y) of the body (2), which is provided with a cross section (10) having a bi-convex lenticular shape.
