FindingKing10 Diamond Burs Lapidary Rock Grinding Tool

works well, exactly as described. Pricey but effective. I used these for grinding and cutting brick. The bricks come from the foundations of old homes with varying composites. Tools were a bit slow to cut through at first but I don't have the highest quality version of a dremmel. My RPM is high enough but I need to make sure I let it spin to full capacity and move a little slowly to get the cuts. Cut easily through the old mortar and also through the brick. Quality tools, not sure how long they will last but I used a few bits to go through about 40 bricks working edges and also removing pieces of the brick while coring holes out of them and they are going strong.

great price and what I expected thank you

I use the larger burs (rounded & tube shape for grinding my dogs nails (smoothing) . These work VERY well - do not cause "friction heat" on the nail as a sanding band will - making it more comfortable for the dog and takes less time and effort to remove/smooth excess nail.

I bought a few different diamond drilling bits to use on beach stones ... some lasted only for one rock! These are still good! You can tell by sight/touch whether the diamond has worn off, and I'm so pleased that these work so well. I always use under water at the lowest possible speed to prevent heating (which burns off the diamond dust) and all the rocks are the same relatively soft stone. Harder stone like quartz will definitely wear them out faster.

These really don’t function very well on the material I need them.. grinding down glass or ceramics.