... drillsMade of high-speed tool steel, strictly according to the national standards,including general, long, lengthened and extra-long taper shank twist drills ... ,the products quality and their long life-span have been keeping ahead in the tool-making industry which make them the ... Color:Black oxide,Bright,TIN coatedProcess:Roll Foreged,milled,Extruded Long taper shank twist drill bit DIN341