Twist drill HSS - Maykestag DIN338 RN 4.9 mm. This precision-ground twist drill features a short, right-hand cutting cylindrical shank and is designed for industrial quality drilling in alloyed and unalloyed steels, grey cast iron, malleable cast iron, copper alloy, nickel silver, graphite, and sintered iron. Its wide flutes and reinforced core allow for a drilling depth nearly equal to the length of the twist, ensuring good chip removal. The point angle is 118°, and the surface is blued from 1.0 mm. All dimensions from 4.0 mm come with special grinding "AC." This industrial quality drill is suitable for NC machines and is precise due to a modern grinding process, while being breakage resistant thanks to CNC-controlled heat treatment.