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Terebrae API IADC537 5 5/8″ (142.9mm)
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Terebrae celeres e carburo tungsteno IADC537 5 7/8″ (149mm)
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Tesserae tricônicae saxorum IADC537 6 pollices (152.4 mm)
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Terebra triconica rotatoria IADC537 6 1/4 unciarum (159 mm)
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Terebrae tricônicae saxorum TCI IADC537 6 3/4″ (171mm)
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Fresa API ad fibulam IADC537 6.5 uncias (165mm) pretio imminuto
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Terebra saxorum TCI IADC537 7 1/2" (190 mm)
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Terebra triconica fabricae API IADC537 7 5/8" (193.7 mm)
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Terebra triconica TCI IADC537 7 7/8 unciarum (200 mm)
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Terebra Inserta Carbidi Wolframii IADC537 8 1/2″ (215.9mm)
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Terebra saxorum API IADC537 8 3/4″ (222.2mm) pretio imminuto
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Terebra TCI IADC537 9 1/2″ (241mm) ad puteum olei saxorum durum