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Bore size

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Open the tool →内孔尺寸 (nèi kóng chǐ cùn) means “Inner diameter, Bore size”.
内孔尺寸 is pronounced nèi kóng chǐ cùn in Mandarin Chinese.
“Inner diameter” is 内孔尺寸 (nèi kóng chǐ cùn) in Chinese.