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Terebrae Cylindri Triconicae IADC517 9.5 unciae (241mm)
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Terebra Triconica Putei Profundi IADC517 7 7/8 unciarum (200mm)
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Terebrae saxorum obsignatae TCI IADC517 6 1/2″ (165mm) ad puteos perforandos
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Terebrae cylindri triconici IADC517 6 1/4″ (159mm)
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Terebrae rotatoriae API cum globulis obsignatis IADC517 5 1/4″ (133mm) in promptu
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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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Terebra conica cylindrica biit IADC637 4 5/8″ (118mm)
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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