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Cov khoom siv dov lub khob hliav qab IADC216 5 5/8 nti (143 hli)
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Cov khoom siv dov kaw IADC216 5 7/8inches (149mm)
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Cov khoom siv Tricone hauv Tshuag IADC216 6 3/4 nti (171mm)
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Lub ntsis dill tig IADC216 7 7/8 nti (200 hli)
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Cov khoom siv rotary IADC216 10 5/8 nti (269mm)
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Yuav cov khoom siv tho qhov IADC216 17.5″ (444.5mm)
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Tricone ntsis IADC217 4.5 nti (114 hli) rau kev khawb pob zeb tob tob
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API kaw lub khob hliav qab rau kev khawb IADC217 5 7/8 nti (149.2 hli)
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API cov khoom siv IADC217 8 3/4 nti (222.2 hli)
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lag luam wholesale drilling bits IADC217 17.5 nti (444.5mm)
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Cov hniav hlau tricone ntsis Hoobkas IADC114 17.5 nti (444.5mm)
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Cov ntsis tho qhov rau cov cement IADC127 4 3/4 nti (120 hli)