HSS Drill Bit,DIN345 Twist Drill Bit 1) DIA: 1/8 to 4-1/4 INCH or ... to 120mm 2)Materail:HSS9341 M2 M35 M42 HSS drill bit DIN345, Taper shank twist drillsMade of high-speed tool steel ... ,including general, long, lengthened and extra-long taper shank twist drills,the products quality and their long life-span have been ... oxide,Bright,TIN coatedProcess:Roll Foreged,milled,Extruded Hss Drill Bit