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Darnau dril carbid twngsten cyflymder uchel IADC537 5 7/8″ (149mm)
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Darnau craig tricone IADC537 6 modfedd (152.4 mm)
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Bit tricone cylchdro IADC537 6 1/4 modfedd (159 mm)
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Darnau roc tricone TCI IADC537 6 3/4″ (171mm)
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Bit botwm API IADC537 6.5 modfedd (165mm) gyda phris gostyngol
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Darn roc TCI IADC537 7 1/2 ” (190 mm)
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Bit tricone ffatri API IADC537 7 5/8 ” (193.7 mm)
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did tricone TCI IADC537 7 7/8 modfedd (200 mm)
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Did Mewnosod Carbid Twngsten IADC537 8 1/2″(215.9mm)
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Bit dril roc botwm API IADC537 8 3/4″ (222.2mm) gyda phris gostyngol
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Did dril TCI IADC537 9 1/2″ (241mm) ar gyfer ffynnon olew craig galed
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Darnau drilio ffynnon roc API IADC537 10 5/8 modfedd (269mm)