Abstract: The invention relates to a rotary tool (2), in particular a drill, having a cutting part (10) that extends in a longitudinal direction (8) from a clamping shank (6) arranged in a rearward region (22) to a tool front (12) arranged in a forward region (20), and in which helically running chip flutes (14) and continuously helically running coolant channels (36) are fashioned, such that an exit opening (42) of each coolant channel (36) is arranged in the respective chip flute (14), wherein the chip flutes (14) are each shaped with an angle of twist (?) varying in the longitudinal direction (8) such that, in the forward region (20) facing towards the tool front (12), the respective coolant channel (36) is intersected by the respective chip flute (14) so as to fashion the exit opening (42).

Abstract: The modular carrier tool (2), in particular drilling tool, extends along a central longitudinal axis (4) in axial direction (6) and comprises a carrier (8) as well as a tool head (10) that can be reversibly mounted on the front-end of the carrier (8). The carrier (8) has a head retainer (14) for the insertion of the tool head (10) as well as clamping webs (24), which radially delimit the head retainer (14) and also have bearing surfaces (28). The tool head (10) comprises clamping surfaces (35) extending in axial direction as well as underhead bearing surfaces (34). In a mounted state the clamping webs (24) clamp the tool head (10) in radial direction to the clamping surfaces (35) and the underhead bearing surfaces (34) are pressed against the bearing surfaces (28).