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There seem to be a few issues of concern with this kit:
Some of the sharpening products on the Accusharp site carry a "Made in the USA" logo, but this 5-Stone Precision Kit does not. Is the claim on Massdrop of "Made in USA" for this kit correct? I rather doubt it.
Massdrop describes the kit as coming with four Aluminum-Oxide stones and a Ceramic stone, but the pdf instructions describe the kit as including three Aluminum-Oxide stones, a Diamond stone and a Ceramic stone.
If the pdf instructions are correct, the most obvious problem is that either the 320x Diamond or the 280x Aluminum-Oxide stones are actually the finest stones you can use on ordinary knives. The 1500 grit ceramic stone appears to be beveled and only suitable for sharpening serrated knives (and I'd have to wonder how suitable it would be for most of those, given the large range of different shapes and sizes used for serrations).
I don't know what grit rating system (or systems) they're using, but I'm not familiar with any common system where either 280 or 320 grit would be considered appropriate for a finishing stone in a knife sharpening setup.
The beveled ceramic stone can be used on flat blades, you just don’t get as much surface contact. I use the edge of the Spyderco Sharpmaker stones all the time for flat blades.
yeah, after reading the PDF I wish I didn't go for this. I liked the table stand thing. What is the deal with the stone grits!? The lansky kit is 120/280/600 and that works great, but I'd like a 1000 to finish. What is the deal with this ending at 280? I may email them and if I get a response I'll post.