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Giotán druileála cairbíde tungstain ardluais IADC537 5 7/8″ (149mm)
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Giotán carraige tríchóin IADC537 6 orlach (152.4 mm)
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Giotán tricone rothlach IADC537 6 1/4 orlach (159 mm)
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Giotán carraige tricone TCI IADC537 6 3/4″ (171mm)
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Giotán cnaipe API IADC537 6.5 orlach (165mm) le praghas lascainithe
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Giotán carraig TCI IADC537 7 1/2” (190 mm)
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Giotán tricone mhonarcha API IADC537 7 5/8” (193.7 mm)
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Giotán tricone TCI IADC537 7 7/8 orlach (200 mm)
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Giotán Ionsáigh Carbide Tungstain IADC537 8 1/2″(215.9mm)
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Giotán druil carraig cnaipe API IADC537 8 3/4″ (222.2mm) le praghas lascainithe
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Giotán druil TCI IADC537 9 1/2″ (241mm) le haghaidh tobair ola carraige crua
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Giotán druileála tobair carraig API IADC537 10 5/8 orlach (269mm)