Drill bit made of high-speed steel (4241) with a hardness of 62°HRc (+/-2°). It features a tip angle of 118° and straight grinding without cutting correction, suitable for manual sharpening. Diameter tolerance: h8. Right-hand threaded drill bit with N-type spiral, hot-rolled on forged wheels, offering high flexibility and torsional strength, with ground cutting edges. Cylindrical shank matching the diameter of the drill bit. The surface of the drill bit is coated with an oxide layer, providing a low friction coefficient, reducing the risk of workpiece adhesion to the drill bit, and increasing drilling efficiency. Intended for general use, for machining alloys and carbon steels with hardness up to 250Bhn, gray cast iron, non-ferrous metals, and hardened plastics. Complies with DIN-338 standard. Use with coolant is recommended. Diameter: 3.5mm. EAN: 5900171530359