HSS Straight Shank Twist Drill Bits competitive price and high quality prompt shipment and best service HSS Straight Shank Twist Drill Bits Producttion technics : fully ground,roll & polished, roll forged,Miledmaterial:M42,M35,6542,9341,4341,4241standard : DIN338/340/1897, ASME B.94,11M---1993……split point: 1180/1350Surface finishing: Black oxide, bright, tin coating, rainbow color……