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Very high quality. Much better than a name brand diamond burr I purchased at the hardware store (one of which cost 3x what this entire set cost).
If grinding and shaping remember to keep moist with water or lubricant. Some of the finer bits break easily, but the rest do the job. The burs are fairly sturdy. Otherwise you rip off the diamond surface (did this, not thinking).
So many new options have been created since getting this set. I have just started learning to engrave, and had been using the accessories that came with my rotary tool, but then I got this set and they are pretty much all I use now. I highly, highly recommend this set for anyone in the engraving craft.
30 is a lot and it covers all you could need. This is a very good product. I work with silver and have a drill stand in the club and often need different sizes so this was ideal.Packed very well to be able to see just what one you need at the time.
With these bits, I can drill small holes through seashells, beads & glass without chipping. The diamond part does wear down after drilling a lot, but for the price I think it is a great deal & it gets the job done. I bought this item to use for my jewelry craft items. The bits work perfect in my Dremel tool.
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