Have owned this for over a year and use it on my SOG opener. The plastic handles broke after a few months. I can still use it but not as comfortably. It needs to be washed with soap and water now, don't worry. But I am writing this review because I have found that it will sharpen my Spyderco Endura 4 (VG-10 steel). I've given up wearing the Endura because I couldn't easily and effectively sharpen it with my stone or diamond sharpeners. When I cut myself opening the SOG I decided to go back to the Endura and figure out how to sharpen it no matter how long it took. I was very surprised that the red-green DMT VG-10 steel sharpens quite easily (or maybe I finally sharpen knives better). So I'm thankful for DMT. Well, if you can handle this smartly and solidly, I'll buy an improved version. As for remembering what's what, I think stop (red) and then go (green) as it's a little difficult to feel the difference in grain through the copper mesh.
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