The Micro 100 Engraving Tool Single End 16R901 is a high-speed steel engraving tool with a single end cutting edge. It has a shank diameter of 1/8 inch and an overall length of 3 inches. The tool features a 135 degree point angle for detail engraving in materials like plastics, wood, aluminum and brass. It can be used in low to medium production runs at spindle speeds up to 15,000 RPM. The tool's high-speed steel construction provides good wear resistance.