Drilling tool

A drilling tool comprising:

• at least two chip flutes defining a core diameter therebetween;
• and
• a chisel edge with a thinned region disposed on either side thereof defining a thinned core diameter less than the core diameter;
• and
• a pair of opposing major flanks disposed on opposite sides of the chisel edge,
• wherein the thinned region:
• comprises a portion of each of the at least two chip flutes and forms an end of each of the at least two chip flutes in the region of the chisel edge, and
• merges continuously, without any discontinuities, without any kinks, and without any ridges, into a remainder of each of the chip flutes in such a way that the thinned region forms the end of the respective chip flute in the region of the chisel edge,
• wherein each of the chip flutes:
• extends continuously, without any discontinuities, without any kinks, and without any ridges, to each of:
• the chisel edge, a respective one of the major cutting edges, and a respective one of the major flanks;
• and
• is fully concave toward a central axis of the drilling tool, when viewed in transverse cross-section at one or more axial points along the chip flute;
• wherein the tool comprises a core diameter that is reduced steadily, from a normal core diameter to a reduced core diameter at the chisel edge by the thinned region;
• the normal core diameter being constant between the thinned region and a region of run-out of the chip flutes.