PDC Drill Bit, Tricone Drill Bit, Tricone Hole Opener manufacturer / supplier in China, offering Roller Cone Bit 10-5/8" Tricone Drill Bit of Diamond Drilling Bit, 14-3/4" IADC 745 Hard Rock TCI Tricone Bit, Rock Roller Cone Bit 12-1/4" Tungsten Carbide Insert Tricone Bit and so on.