What is a Tungsten Carbide Burr Die Grinder Bit? What is a Tungsten Carbide Burr Die Grinder Bit?  Tungsten Carbide burrs can be used on most hard materials: metals including steel, aluminum and cast iron, all types of stone, ceramic, porcelain, hard wood, acrylics, fibreglass and reinforced plastics. When used on soft metals such as [...]