I bought these because they had great reviews from other buyers. I needed good quality wood carving drill bits that would do the job well and would definitely fit the bill. I recently used them to carve the word SUBSCRIBE into a block of wood. This was my first time doing mechanical wood carving with a dremel rotary tool, so I have no experience of the difference between quality bits and crappy bits. However, I have to say that these beats have worked well for me. I have a Dremel 4300 rotary tool and I used my Dremel at 15,000 rpm and that speed was enough to get these bits to do their job and remove a lot of material. Given their massive size, I'm not sure a battery-powered Dremel can move large eardrums through dense wood, but my corded 1.8A Dremel definitely will! I'm also not sure if that matters or not, but I've used these bits in a Dremel 225 flex shaft attachment and they worked great with it. Can't comment on longevity as I owned it not long ago. But when it comes to durability, they're good, because even after the shield has been carved, a lot of flesh remains on it. So let's hope they last a long time. For now, I give these beats a solid 5 out of 5 stars!
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