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Tricone Roller Bits IADC517 9.5 inches (241mm)
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Gyratorius triconus Bits IADC517 9 7/8″ (250mm) pro silice duro
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Tres pyramides petrae IADC517 10 5/8″ (269mm)
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Rotarium petrae IADC517 11 5/8″ (295mm)
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Gyratorius triconus bit IADC517 12 1/4″ (311mm)
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Tres pyramides bit IADC517 13 5/8″ (346mm)
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API Bulla terebra frenum IADC517 17 1/2″ (444.5mm)