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API praebitor terebrarum perforandarum saxorum profundorum IADC537 9 5/8″ (244.5mm)
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Terebra API TCI IADC537 9 7/8″ (250mm) ad puteos saxorum duriorum perforandos
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Terebra Rotatoria IADC537 3 7/8″ (98mm)
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Terebrae triconicae IADC537 4 3/4″ (120.6mm)
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Terebra triconica API IADC537 14 3/4″ (374mm) ad saxum durum perforandum
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Terebrae Triconicae IADC537 4 5/8″ (118mm)
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Terebra API triconica saxorum IADC537 5 1/4″ (133mm)
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Terebra saxorum API IADC537 5 1/2" (139.7 mm) ad puteos duros perforandos
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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)