The Micro 100 Engraving Tool Single End 16R989 is a high-speed steel engraving tool with a single end cutting edge. It has a shank diameter of 1/8 inch, an overall length of 3 inches, and a cutting diameter of 1/32 inch. This engraving tool is designed for hand engraving in materials like plastics, soft metals, wood, and fiberglass. It can produce fine detailed engravings with its small cutting edge. The tool has a 3 inch reach for engraving recessed areas. It is made in the USA from M2 high speed steel for good wear resistance and heat tolerance. The 16R989 is a quality engraving tool well suited for detailed hand engraving work.