I was skeptical because of the price and expected more flexibility (I've never used this type of bit) but they are great! When it comes to precious metals, you should definitely exercise caution and caution. I've used them mostly to clean rusty tools and restore some metal home decor items. They polish better and faster than cotton beans, with little to no loss of material. Since they come with 6 mandrels and 6 grains, I can keep one of each loaded and ready to go. They got here quicker than expected - very happy with it!
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