摘要:
The invention relates to a drill (1) having a shaft (4) along an axis (2) between a drill head (3) and an insertion end (5). The shaft (4) is provided with at least two first grooves (34) extending along the axis (2) and at least one second helical groove (31). The first grooves (34) and the second groove (31) cross one another at several intersections (41). A groove width (35) of the first groove (34) continuously decreases in the course between two adjacent intersections (41) from one of the intersections (41) to a narrowest point (42). After the narrowest point (42), the groove width (35) continuously increases to the other of the intersections (41).