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Gwneuthurwr darnau tricone IADC127 4 9/16 modfedd (115.9mm)
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Ffatri darnau Tricone IADC127 5 7/8 modfedd (149mm) ar gyfer drilio ffynnon galed
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Ffatri darnau dril cyfan IADC127 6 1/4 modfedd (158.8mm)
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Cyflenwr darnau Tricone IADC127 7.5 modfedd (190mm)
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Darnau drilio mewn stoc IADC127 7 7/8 modfedd (200mm)
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Darnau drilio rig API IADC127 8 1/2 modfedd (215mm) ar gyfer craig galed
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Darnau tricon mewn stoc IADC127 8 3/4 modfedd (222mm)
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Darnau dannedd melin API mewn stoc IADC127 9.5 modfedd (241mm)
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Disgownt darnau tricone 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 ffynnon ddwfn IADC127 13 5/8 ” (346mm) mewn stoc