- Suitable for alloyed and non-alloyed steel up to a tensile strength of 900 N/mm², cast steel, cast iron, sintered iron, malleable cast iron, non-ferrous metals, hard plastics- Precision-ground HSS-G drill bit enables up to 40% faster drilling rate and up to 50% lower feed pressure than standard-ground HSS drill bits with a chisel edge- Self-centring split point drill tip means there is no need to pre-punch or pilot drill up to 10 mm diameter- The HSS-G drill bits are available in two qualities. The Topline drill bits are for the highest requirements and the standard drill bits are for professional use