PDC Drill Bit, Tricone Drill Bit, Tricone Hole Opener manufacturer / supplier in China, offering Tricone Drill Bit 12-1/4 with TCI Tooth of API Roller Bit, Roller Cone Bit 10-5/8" Tricone Bit of Oil Well, Tungsten Carbid Insert Tricone Drill Bit 6-3/4" Iad 535 and so on.