Diameter laser-sintered in the groove, the special shank prevents slipping in the drill chuck, for burr-free drilling and reaming of sheet metal, pipes and profiles, works without burrs and chatter marks and can be used in hand or box column drills, straight groove, for sheet steel 0, 1-2 mm, stainless steel (V2A) 0.1-1 mm, plastics up to 10 mm, non-ferrous metals 0.1-5 mm, additionally surface-hardened, resulting in a high increase in hardness to over 1000 HV, tenifer-coated