Drilling tools manufacturer / supplier in China, offering API 8 1/2" IADC547 Kingdream Rock Bit Tricone Bit Jz Rock Drill Bit, API 5 1/2" IADC617 TCI Tricone Bit for Water Well Oil Well Drilling, API 11 3/5" IADC527 Kingdream TCI Tricone Bit Rock Drill Bit and so on.
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