PDC Drill Bits, Tricone Bits, DTH Hammer manufacturer / supplier in China, offering TCI Tricone Drill Bit 9-1/2 Inch Rock Roller Cone Drilling Bit, 16 Inch Solid Carbide TCI Roller Tricone Drilling Rig Bit, Manufacture 7 7/8 Inch Milled Tooth Tricone Drill Bit of Rock Drilling Tools and so on.