These discs work great, last a long time and hold very well in the holder. I have only used them with water and have been very happy with their cutting action and durability when wet sharpening. Even when they were almost worn out, they could easily be detached from the turntable. I'm not sure how the committee determined the actual number of discs it would contain for each grit, but they're honest about it in their product sales text, so that's to be expected when they arrive. I would have liked an equal number of all drives, but they work well enough that I won't complain too much about something like that. Keep in mind that their grit is "lighter" medium to very fine (which is what I wanted) so don't expect the grit profile included in the kit to blow things up quickly as it doesn't. . I will definitely be getting more of these when the time comes.
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