N/a manufacturer / supplier in China, offering API Factory 3-1/4"~26" S121 M222 S323 Steel /Matrix Body PDC Diamond Drill Bits for Oil and Gas Drilling, Best Quality 7 Blades API 12 1/4 Inch Steel and Matrix Body PDC Drill Bit in Stock, Hot-Sale 17 1/2" 444.5mm IADC535 /537 API Tricone Rock Roller Cone Bit, Water Oil Gas Drilling, Factory Price and so on.
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