May I ask for help for these sentences?

thsean · (#1 (**permalink**))

Sumimasen, really sorry to bother, but may I ask for help about two sentences?

中目 #280 磨耗の少ないとき、仕上げ
荒目 #120 磨耗の多いとき、下地研ぎに

I think it's some knife intructions.

May I know what do they mean?

RadioKid · (#2 (**permalink**))

It is instructions for sand papers.

#280 when the object is not so damaged or finishing up.
#120 when the object is heavily damaged or pre-finishing up.

thsean · (#3 (**permalink**))

Quote:

Originally Posted by RadioKid

It is instructions for sand papers.

#280 when the object is not so damaged or finishing up.
#120 when the object is heavily damaged or pre-finishing up.

Thank you so much for your help!! You are the best!