twist drill bit set Material: HSS 4241, 4341, 9341, 6542 Finish: Black Finshed, Tin ... : Black Finshed, Tin Coated, Bright, etc.Process: Roll Forged , Edge Ground or Fully GroundPacking: Plastic Box, PVC Bag H101-1 black ... oxideH101-2 edge groundH101-3 edge ground,tin coatedH101-4 fully ground,brightH101-5 fully ground,black finishedH101-6 fully ...