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Terebrae in promptu IADC127 7 7/8 unciarum (200mm)
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Terebrae triconicae pretio vili IADC127 9 5/8” (244.5mm)
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Caput rotans pro machina IADC127 9 7/8” (250.8mm)
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Terebrae rotatoriae tres coniformes IADC127 11 5/8" (295mm)
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Terebrae puteorum profundorum IADC127 12 1/4" (311mm)
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Terebrae puteorum ad mensuram aptatae IADC127 14 3/4" (374mm)
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Tesserae triconicae IADC127 17.5 pollices (444.5 mm) in grosso