Tricone Bit, PDC Bit, Hole Opener manufacturer / supplier in China, offering 13 5/8′′ Milled Tooth Tricone Bit Rotary Roller Cone Bit, 10 5/8′′ 269mm PDC Bit Diamond Chisel 4 Blades, 269mm PDC Drilling Bit Steel Body 3 Blades and so on.