1.PDC bit,PDC drilling bit 2.certified by ISO,API 3.wide size ... .best quality,price 5.delivery on time 1.PDC bit,PDC drilling bit2.certified by ISO,API3.wide size ... code4.best quality,price5.delivery on time PDC bit for example character: PZ1951 Deep blade and long parabolic ... flow and anti-baling.Balanced flow hydraulics make the bit have good direction nature and enhance the drilling stability ...