Suitable for alloyed and non-alloyed steel up to a tensile strength of 900 N/mm², non-ferrous metals, cast iron, hard plastics. High elasticity due to low-heat shaping manufacturing process. Low risk of breakage – especially when drilling with diameters smaller than 6 mm. Spiral flute with oxide coating for rapid chip removal. Long lifetimes due to tough core thickness and distinct hardness within the area of application. 19-piece ProBox metal drill bit set HSS-R, DIN 338. 1-10 mm.