... general drilling.For drilling in steel, cast steel, malleable iron, sintered metal, non-ferrous metal and plastics.Dia. ... rotate counterclockwise.Application: For drilling in steel, cast steel, malleable iron, sintered metal, non-ferrous metal and plasticsDia. 1mm - ... prevents spinning and slippageFor drilling in steel, cast steel, malleable iron, sintered metal, non-ferrous metal and plasticsDia.1mm ...