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Zosindikizidwa zokhala ndi kubowola bts IADC126 9 7/8 mainchesi (250mm)
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Tricone kubowola bits ogulitsa IADC126 12 1/4 mainchesi (311mm) pobowola bwino
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Pang'ono pobowola bwino IADC127 3 7/8″ mainchesi (98.4mm)
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API trione kubowola IADC127 4 5/8 mainchesi (118mm) zogulitsa
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Fakitale yosindikizidwa ya bits IADC127 6 mainchesi (152mm)
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Zobowola zakuya IADC127 12 1/4 ” (311mm)
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Diamondi trione pang'ono IADC216 7.5 mainchesi (190mm)
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Tricone bits fakitale IADC216 9 7/8 mainchesi (250.8mm)