PDC bit, PDC drill bit,oil drill bit certified by ISO,API. cover wide size, code high quality best price delivery on time. PDC bit, PDC drill bit,oil drill bitcertified by ISO,API.cover wide size, codehigh quality best price delivery on time.PDC bit1. 81 / 2 "F6195J/M3232.The unique six-wing blade angle setting at the tooth with a sharp cutting edge, so the highest penetration rate.3. parabolic ...