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Drileagan API IADC537 5 5/8″ (142.9mm)
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Drileagan carbide tungsten aig astar luath IADC537 5 7/8″ (149mm)
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Pìosan creige tricon IADC537 6 òirlich (152.4 mm)
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Bit rothlach tricone IADC537 6 1/4 òirleach (159 mm)
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Pìosan creige tricone TCI IADC537 6 3/4″ (171mm)
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Bit putan API IADC537 6.5 òirleach (165mm) le prìs lasaichte
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Pìos creige TCI IADC537 7 1/2” (190 mm)
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Bit tricone factaraidh API IADC537 7 5/8” (193.7 mm)
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Bit tricone TCI IADC537 7 7/8 òirleach (200 mm)
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Bit Cuir-a-steach Carbaid Tungstan IADC537 8 1/2″(215.9mm)
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Drile creige le putan API IADC537 8 3/4″ (222.2mm) le prìs lasaichte
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Drile TCI IADC537 9 1/2″(241mm) airson tobar ola creige cruaidh