HMT GoldMax TCT 12x25mm ball nose burr cylinder Is a tungsten carbide burr. Sold individually and designed for use with straight grinders and die grinders. Provides a precision cut, long life and high control. Titanium coating for a long life. Recommended for use with high speed die grinders and straight grinders. 12x25mm ball nose burr. 69mm length. standard 6mm shank