Suitable for alloyed and unalloyed steel up to a tensile strength of 900 N / mm², cast steel, cast iron, sintered iron, malleable cast iron, nonferrous metals, and hard plastics. Precision-ground HSS-G steel drill enables up to 40% faster drilling and up to 50% less power than standard feeding ground HSS drill bits with conical section. The HSS-G drill bits are available in two grades. The Topline drill for the highest requirements and the standard drill for professional use. 4-pack. 15 x 144 169 mm. Metal drill bits HSS-G, DIN 338