The first test anyone should do with these stones is the flatness test. The rough side was fine, but the middle side (400 grit) was bowed in the middle. A quick check of my cast iron table saw revealed a pronounced crease, but even when viewed from the side I could see a very noticeable crease. Not suitable for tools for sharpening tools. I was also going to buy the SF/F version but that version is coming back and I'll look into alternatives.
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