... ,plenty experience timely delivery ISO9001 HSS STRAIGHT SHANK TWIST DRILL BIT,DIN338, BLACK OXIDEHot rolled flute, ... steel.Coating is very hard giving very long drill bit life, up to 8 times. ... .Suitable for metal, wood, plasticsHSS TWIST DRILL BITS - 1/4" HEX SHANKHigh speed steel made.DIN ... non-ferrous metal and plasticsDia.1mm -13mmHSS Drill Bit, Morse Taper Shank, General Purpose, DIN 345 Roll-forged ...