Review on 🔩 Efficiently Grind and Polish with 1/8" Shank Diamond Coated Cylindrical Grinding Mounted Point Bits Burrs - 10 pcs Set for Rotary Tools by Brad Dotson

They are exactly as described in the listing and for the price they are a good buy. They are covered in very fine grain diamonds so they tend to clog (for lack of a better word) and I have to rinse and/or wipe frequently during use. On the other hand, they're great as the last step in the polishing process. They come in a variety of sizes, the largest being around 1/2 inch and the smallest being slightly larger than a medium sized ballpoint pen. But they all have the same granularity, although they appear to be of different granularity in the photos. It's hard to quantify how long they will last as every project is different, but if it helps I've drilled holes at around 45-50. Shells before I had to replace the ridges. I recommend these burrs, for the price they are good value.