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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).
The burs are fairly sturdy. If grinding and shaping remember to keep moist with water or lubricant. Otherwise you rip off the diamond surface (did this, not thinking). Some of the finer bits break easily, but the rest do the job.
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. So many new options have been created since getting this set. I highly, highly recommend this set for anyone in the engraving craft.
This is a very good product. 30 is a lot and it covers all you could need. 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.
I bought this item to use for my jewelry craft items. With these bits, I can drill small holes through seashells, beads & glass without chipping. The bits work perfect in my Dremel tool. 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.
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