The fully High Speed Ground twist drill has a more precise concentricity. Application areas: For steel, alloyed and unalloyed cast iron (up to a strength of 900 N/mm²), grey, malleable, ductile and die-cast iron, sintered iron, nickel silver, graphite, short chipping aluminium alloys, brass and bronze. Contains 10 x 1-6.0MM in 0.5MM increments and 10 x 3.3MM & 10 x 4.2MM