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The phrase "in diameter" is correct and usable in written English.
You would use it when referring to the width of a circular object, such as a cylinder or sphere. For example, you could say, "The bowling ball was 8 inches in diameter."
Exact(60)
(9 cm) in diameter.
7.5cm in diameter.
It's 16 inches in diameter.
They're 19 inches in diameter.
"Two inches in diameter," Mr. Lee estimated.
Its tires are 35 inches in diameter.
It was nearly a mile in diameter.
nearly 1 inch in diameter.
The wheels are 10 inches in diameter.
Both are 100 metres in diameter.
Cut out rounds of 10cm in diameter.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com