Tricone Bit, PDC Bits, Drag Bits manufacturer / supplier in China, offering Regular Size 8 1/2" IADC537 Tricone Bit/Rock Drill Bit, Factory Hot Selling, 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, and so on.