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Darnau dannedd Melin API IADC217 12 1/4 modfedd (311mm) ar gyfer drilio'n dda
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Darnau drilio pris isel IADC217 14 3/4 modfedd (374mm) ar gyfer craig galed
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darnau drilio cyfanwerthu IADC217 17.5 modfedd (444.5mm)
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4 1/4 Modfedd PDC Llusgo Bit 3 Llafnau
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Ffatri API o bit tricone TCI IADC617 5 5/8″ (142.9mm)
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Bit tricone cylchdro API IADC617 6 ” (152mm) ar gyfer drilio'n dda
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Darn roc tricone IADC617 8 1/2″ (215.9mm) ar gyfer drilio'n dda
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Gwneuthurwr API o bit roc tricone IADC617 9 7/8 modfedd” (250mm)
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Ffatri API o ddarn rholer tricone IADC617 12 1/4 modfedd (311.1mm)
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Ffatri API o ddarnau drilio creigiau IADC617 17 1/2 modfedd (444.5mm) mewn stoc
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API carbid twngsten mewnosod bit dil graig IADC627 3 7/8″ (98mm) mewn stoc
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Did rholer cylchdro IADC627 8 1/2″ (215mm/216mm)