PDC Bits, Coring Bits, PDC Reamer manufacturer / supplier in China, offering High-Quality 610mm PDC Hole Opener for Enhanced Performance, High-Performance Eho1635r 610mm (24") PDC Hole Opener / PDC Reamer – Advanced Cutting Structure for Faster Rop & Extended Durability in Hard Formations, API Factory Tungsten Carbide Made 8-1/2 Matrix Body PDC Drill Bit with 7 Blades and so on.