Cutting tool

A cutting tool comprising an arbor head having a protuberance provided in the central part of said arbor head coaxially therewith, a bolt adapted to be screwed into said protuberance, a collar fitted on the shank of said bolt, the periphery of said collar being provided with two enlarged portions symmetrical about the axis of said collar, said collar being adapted to follow the axial movement of said bolt but not to rotate on its own axis, two guide pins, one end of each of said two guide pins being fixed to each of said two enlarged portions of said collar, the other end thereof being slidably inserted in each of two holes provided in said protuberance in parallel with the axis thereof, a cutter provided with a center hole having a shoulder midway of the depth thereof, and a ring fixed to said shoulder and provided with a hole having a shape similar to, but slightly larger than, the shape of said collar.