Premium Carbide Cutter Rotary Burr SetPremium Carbide Cutter Rotary Burr Set processing all kinds of metal (burr bits for metal carbide burrs for steel including all sorts of hardened steel) and non metal (such as marble, jade, bone). For the most work rotary burr set can be replaced with a small grinding wheel and no dust pollution. Dual Chamber is crossover lines, not easy to block the lines, more suitable for the object of relatively low density material. Easy to use, safe and