The Micro 100 Engraving Tool Single End 16R875 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, soft metals, wood, and fiberglass. It can be used in low horsepower, high speed engraving machines. The tool has a Rockwell hardness of C64-66 for wear resistance. It allows for fine detail engraving work in industrial and craft applications.