Tricone Bit, PDC Bits, Drag Bits manufacturer / supplier in China, offering Singe Roller Cone Bits 8 1/2" IADC537/637/737 Segments/Palm/Cutter of Tricone Bits, Pile Cutter of Tricone Bit, Special Roller for Reamer in Trenchless, Hole Openers with Roller Cone Palm/Single Roller Cone Bit, Rock Reamers for HDD/Trenchless/No Dig,, Factory Price API 12 1/4" Tricone Bit, 311.15mm Roller Cone Bit, Rock Drill Bit for Water, Oil and Gas Well Drilling and so on.