... shank drill bit oxide finish, bright finish, nitride, tin-coated made of high speed steel reduced shank drill bitwe can produce 1/2 shank , 1/4 shank ... , 3/4 shank, 3/8shank, s&d, jobber ... ten years history of manufacturing the high-speed steel twist drill. We are specialized in producing 4241, 4341,9341,6542,M35 ...