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Darnau drilio mewn stoc IADC127 7 7/8 modfedd (200mm)
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Darnau tricon disgownt IADC127 9 5/8” (244.5mm)
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Pen cylchdroi ar gyfer rig IADC127 9 7/8” (250.8mm)
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3 darn rholer côn IADC127 11 5/8” (295mm)
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Darnau drilio ffynhonnau dwfn IADC127 12 1/4” (311mm)
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Darnau drilio ffynhonnau wedi'u haddasu IADC127 14 3/4” (374mm)
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Darnau tricon cyfanwerthu IADC127 17.5 modfedd (444.5mm)