The Bosch Professional HSS-G Metal Drill Bits are designed for drilling deep holes in metal with maximum precision. These bits are made from high-speed steel (HSS) and are precision-ground for enhanced performance. The 135-degree self-centring split-point tip ensures active cutting and perfect centring without wandering, eliminating the need for pre-punching or pilot drilling for holes up to 10mm. This design allows for up to 40% faster drilling rates and up to 50% lower feed pressure compared to standard-ground HSS drill bits. They are manufactured to DIN 340 standards, featuring a Type N flute and an h8 diameter tolerance. These drill bits are suitable for drilling in alloyed and non-alloyed steel, cast steel, cast iron, sintered iron, malleable cast iron, non-ferrous metals, and hard plastics. They have a cylindrical shank system and are intended for use in drill stands and drill drivers. This particular pack contains five 3mm diameter drill bits, each with a total length of 100mm and a working length of 66mm.