drill bit hss drill bit set twist drill bit Certification:ISO9001 Finish:Tin coated,coffee,bright,rainbow drill bit,hss drill bit set,twist drill bitFeatures: 1.Material:HSS M42,M35,6542(M2),9341,4341,42412.Finish:Tin coated,coffee,bright,rainbow colour,Black oxide,Black flute & bright shank3.manufactory process:roll forged,edge ground,fully ground4.Standard:DIN 338 (jobber series) DIN 340 (long ...