研磨はしますか

Kenma o shimasu ka?
Do you sharpen skates?

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溝はどのくらいにしますか？

Mizo wa dono kurai ni shimasu ka?
How deep do you want it?

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普通(1/2)

Futsu
“normal” – 1/2

Also other cuts can be said this way:
Ａ分のＢ
A bun no B

For example:
3/8 – 八分の三 (Hachi bun no san)
3/4 – 四分の三 (yon bun no san)

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EXAMPLE

A. 研磨はしますか？
B. はい!溝はどのくらいにしますか？
A. 普通(1/2)でお願いします！

A. Kenma wa shimasu ka?
B. Hai! Mizo wa dono kurai ni shimasu ka?
A. Futsū (1 / 2) de onegaishimasu!

A. Do you sharpen skates?
B. Yes? How deep do you want it?
A. Normal (1/2) Please!