Rotating cutting tool and guide insert therefor

A rotating cutting tool comprising:

• a single or multi-piece support part having an end face and a circumferential wall;
• an interchangeable cutting insert provided at or about the end face;
• and
• at least one interchangeable guide insert coupled to the support part via a retaining means, the at least one interchangeable guide insert being free of cutting edges and protruding radially relative to the circumferential wall,
• wherein the at least one interchangeable guide insert comprises a guide section which protrudes radially furthest outward and a lower-lying surface area that starts from the guide section and does not project radially outward relative to the circumferential wall, and wherein the guide section lies axially at the level of the retaining means and offset from the retaining means in the circumferential direction,
• wherein the at least one interchangeable guide insert comprises an aperture into which the retaining means extends, and wherein the aperture is a radial through-hole for the retaining means.