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Darnau Rholer Tricone IADC517 9.5 modfedd (241mm)
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Darnau tricone cylchdro IADC517 9 7/8″ (250mm) ar gyfer craig galed
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Darn roc tri chôn IADC517 10 5/8″ (269mm)
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Darn roc cylchdro IADC517 11 5/8″ (295mm)
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Bit tricone cylchdro IADC517 12 1/4″ (311mm)
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Did tri chôn IADC517 13 5/8″ (346mm)
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Bit dril botwm API IADC517 17 1/2″ (444.5mm)