PDC Drill Bits, Tricone Bits, DTH Hammer manufacturer / supplier in China, offering High Quality 6′ ′ Inch TCI Tricone Roller Ratory Cone Drill Bit, 152mm Hard Rock Drilling Tools IADC 637 Conical Roller Tricone Bit Sizes, 3 7/8 Inch 98mm Petroleum Well Drill Three Roller Cone Bit IADC 117 Steel Tooth Bit and so on.