Drilling tools manufacturer / supplier in China, offering 311.1mm IADC637g Tricone Drill Bitstci Tricone Bit for Water Drilling, API 8 1/2" IADC547 Kingdream Rock Bit Tricone Bit Jz Rock Drill Bit, API 12 1/2" IADC547 Kingdream Rock Bit Tricone Bit Jz Rock Drill Bit and so on.
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