Review on 🔪 YUFUTOL Carbide Burr Set - 10pcs Double Cut Solid Carbide Rotary Burrs with 3mm (0.118'') Shank for Die Grinder Drill, Woodworking, Metal Carving, Engraving, and Polishing by Reginald Truitt

You did a great job for this money! I had a small screw extractor to snap off the screw hole and none of my drill bits even scratched it. These little ridges did it! It took a bit of work/patience but I was finally able to wear down and recover both the broken extractor and the broken original bolt. If you use burrs every day, spend the money and buy expensive ones, but if you just need them for a simple project and don't want to go broke, I highly recommend them.