These are 3 different grits of the mixture. Does what it's supposed to, for sharpening knives, I use it for restoring clocks. It works great with the Dremel polishing kit and you can polish all types of metal. Stainless Steel, Gold, Silver and Platinum are 4 different materials I have used it on with great results. I almost forgot you can polish scratched plastic. I was servicing and restoring an antique watch for a client and the glass was badly scratched. All your old clocks have acrylic crystal material. I couldn't find a replacement anywhere. The watch was made in 1952, so there are no details. I was able to polish the acrylic crystal and it looked new. He asked me how I found a replacement, I just smiled and said it was a lot of work fixing yours. It is great. A vintage watch you'll want to keep as is. It is possible that simply changing the glass will invalidate the watch.
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