Review on 🔧 10-Piece Tungsten Carbide Double Cut Rotary Burr Set - 3mm (1/8") Shank, 6mm (1/4") Head Size (Style 1) by YXGOOD by Jhon Clark

I used this to sand down the leftover edge of a 3/8 grade 8 bolt before recutting it to clean up the leftover old bolt in a cast iron manifold. I used to drill out the bolt with a 1/4 Bosch universal carbide drill, which easily gnawed through the broken bolt. These knives also cut through steel with ease. I then cleaned the rough and rusty solder flange. All bits were preserved without damage. They are much better than stone mills. They are durable but I can't say how long they will last but I expect they will last. I used them in a Dremel. I suspect the steel shaft may have bent, but that wasn't a problem.