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Darnau drilio API IADC537 5 5/8″ (142.9mm)
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Darnau drilio carbid twngsten cyflymder uchel IADC537 5 7/8″ (149mm)
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Darnau craig tricon IADC537 6 modfedd (152.4 mm)
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Bit tricon cylchdro IADC537 6 1/4 modfedd (159 mm)
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Darnau craig tricôn 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 craig TCI IADC537 7 1/2” (190 mm)
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Bit tricon ffatri API IADC537 7 5/8” (193.7 mm)
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Bit tricon TCI IADC537 7 7/8 modfedd (200 mm)
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Bit Mewnosod Carbid Twngsten IADC537 8 1/2″(215.9mm)
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Darn drilio craig botwm API IADC537 8 3/4″(222.2mm) gyda phris gostyngol
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Dril TCI IADC537 9 1/2″(241mm) ar gyfer ffynnon olew craig galed