I bought # 60 and 80, but the binder performance fixing the abrasive was extremely weak, all the abrasive dropped off just by stroking just a few times, and it became a marbled mesh in a moment (not exaggerated) . Of course, the material to be cut is not scraped a little because it is slightly scratched (despite the fact that metal is also written as correspondence), it does not constitute a body as a file at all. It became completely "lost money". I will never buy this item again. From the following it is expensive but I will buy goods of Honten Honbun which I firmly scrape and last long. . .