Rotatable drilling tool has an insert top detachably connectable to a basic body and at least one chip flute. In each cross-section, each chip flute has a depth equal to the difference between the radius of a cutting circle and a radius of a greatest possible core circle centered on the longitudinal axis and tangential to a limiting curve of the respective chip flute. The basic body is divided longitudinally into a coupling segment, extending axially rearward from a coupling end, and a transportation segment that is situated axially behind the coupling segment, extends rearward toward a fixing end, and is longer than the coupling segment. Each chip flute extends through the coupling segment and the transportation segment. At least essentially the entire female part is situated in the coupling segment, and each chip flute has a smaller depth in the coupling segment than in the transportation segment.