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API fekitori yeRoller cone bit IADC637 3 7/8″ (98mm) iri mustock
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Bhatani bhiti mutengesi IADC637 7 7/8 ” (200mm)
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API trione rock bits IADC637 9 5/8 ” (244.5mm) mustock
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TCI tricone bit IADC617 6 1/2 ″ (165mm) yekuchera
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API mutengesi weyakadzika dombo tsime rekuchera mabhiti IADC537 9 5/8 ″(244.5mm)
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API TCI bhatani bhiti IADC537 9 7/8 ″(250mm) yekuchera tsime rakaomarara
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Rotary Bhatani Bit IADC537 3 7/8″ (98mm)
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Tricone Bits IADC537 4 5/8″ (118mm)
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Tricone drill bits IADC537 4 3/4″ (120.6mm)
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API trione rock bit IADC537 5 1/4″ (133mm)
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API rock drill bit IADC537 5 1/2 ” (139.7 mm) for hard well
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API drill bits IADC537 5 5/8″ (142.9mm)