... Twist Drill Bit 1) DIA: 1/8 to 4-1/4 INCH or 5mm to 120mm 2)Materail:HSS9341 M2 M35 M42 HSS drill bit ... company.Executive standard:GB/T1438.1-1996, GB/T17984-2000,DIN345,DIN341...Material:HSS-9341,6542,M35,M42,HSS4341,HSS4241...Finishing Color:Black ... oxide,Bright,TIN coatedProcess:Roll Foreged,milled,Extruded Hss Drill Bit ...