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Terebra saxorum trium conorum IADC517 10 5/8″ (269mm)
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Terebrae triconicae rotatoriae IADC517 9 7/8″ (250mm) ad saxum durum
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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