Drilling tools manufacturer / supplier in China, offering 9 7/8 mm 637 Kingdream TCI Tricone Rock Roller Drilling Bit for Water Oil Well, 12 1/4 mm IADC 537 Kingdream TCI Tricone Rock Roller Drilling Bit, 15 1/2 Inch 171 445 mm IADC 537 637 Jz Kingdream TCI Tricone Rock Bit and so on.
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