... advanced equipment,plenty experience timely delivery ISO9001 HSS STRAIGHT SHANK TWIST DRILL BIT,DIN338, BLACK OXIDEHot rolled flute, milled flute, right ... ° point angle (135º split angle available).Titanium nitride coating lasts up to six times longer than standard high speed steel.Coating ... is very hard giving very long drill bit life, up to 8 times.For drilling in steel, cast steel, malleable ...