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API trione e cheka IADC216 7 5/8 inches (194mm) bakeng sa mochini oa oli
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Rotary dill bit IADC216 7 7/8 inches (200mm)
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Rotary bits mofani oa thepa IADC216 10 5/8 inches (269mm)
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Reka likotoana tsa ho cheka IADC216 17.5″ (444.5mm)
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Fektheri ea li-cones tse tharo IADC217 3 7/8 inches (98mm)
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Tricone bits IADC217 4.5 inches (114mm) bakeng sa ho cheka seliba se tebileng sa majoe
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API e tiisitsoeng ea "roller cone bit" bakeng sa ho cheka IADC217 5 7/8 inches (149.2mm)
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Likotoana tsa ho cheka ka rotary IADC217 6 inches (152mm)
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API e sila leino likotoana tse tharo tsa li-cones IADC217 7.5 inches (190mm) setokong
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API oli tšepe leino likotoana IADC217 8.5 lisenthimithara (215mm) bakeng sa ho cheka majoe
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API bits supplier IADC217 8 3/4 inches (222.2mm)
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Likotoana tsa ho cheka seliba se tebileng IADC217 11 5/8 inches (295.3mm) bakeng sa lejoe le thata