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I use my King 1K/6K for knives, razors and the occasional tool, it's my sharpening workhorse. As long as you don't mind flattening often there shouldn't be a problem.

Paired with a dmt d8c and a...

I get a decent edge from a King 1K>King 6K>Chromium Oxide on balsa or leather. The shave straight off the 6k is certainly useable, just a little rough.

For $40 the King set looks like a good deal...