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83/4"HM952XA 222.2 인치 강철 바디 오일 잘 Pdc 드릴 비트 Pdc 비트

오일 잘 pdc 드릴 비트, API 표준, 잘 드릴링, 전문 드릴 비트, 다이아몬드 드릴 비트, 중국 드릴 비트에서


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