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Cyflenwr API darnau drilio ffynnon graig ddwfn IADC537 9 5/8 ″ (244.5mm)
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Bit botwm API TCI IADC537 9 7/8″ (250mm) ar gyfer drilio ffynnon craig galed
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Bit Botwm Rotari IADC537 3 7/8″ (98mm)
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Darnau Tricone IADC537 4 5/8″ (118mm)
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Darnau dril tricone IADC537 4 3/4″ (120.6mm)
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API darn roc tricone IADC537 5 1/4″ (133mm)
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Bit dril roc API IADC537 5 1/2 ” (139.7 mm) ar gyfer ffynnon galed
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Darnau dril API IADC537 5 5/8″ (142.9mm)
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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)