or drillings conveyed by way of the drilling dust groove or discharge groove 7 is are supported on the carrying surface 11 which is oriented in the conveying direction 10 and has an approximately right angled profile in relation to the longitudinal axis 12 of the drill according to the illustration of fig1 and the enlarged illustration in fig2 a so called secondary web 13 is located within the discharge groove 7 this secondary web 13 basically constitutes a smaller version of the main web 8 however it may also vary geometrically the discharge groove 7 with the height h 2 is divided up by a secondary web 13 into a bottom groove section 14 with the height h 4 and a top groove section 15 with the height h 5 the height of the secondary web 13 is designated h 8 the outer spine surface of the secondary web 13 is designated 22 the external diameter of the outer spine surface 22 is specified by d 3 the additional secondary web in relation to the main web 8 results in an additional carrying surface 17 which likewise runs approximately at right angles to the longitudinal axis 12 of the drill in the exemplary embodiment according to fig1 and 2 the external diameter d 3 of the secondary webs is dimensioned to be only slightly smaller than the external diameter d 1 of the conveying helix 5 as a result the discharge groove 7 forms a type of double groove with the groove sections 14 15 and the main carrying surface 11 and the secondary carrying surface for the drilling dust accordingly the secondary web 13 likewise runs as a spiral like.