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140mm / 160mm 4 블레이드 PDC 드릴 비트
17 1 / 2inch 445mm TCI 치아에 tricone bit 사용
API insert tooth tricone rock bits
Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.