Dual Dial Engraving Plate】: The ring engraving engraving plate has high precision, 5-inch (125mm) dial, and supports English letters and Arabic numerals on the dial. Perfect Engraving Pen】: The ring engraving machine adopts a sharp diamond pen tip, which can professionally engrave gold, silver and other materials, ensuring precise engraving and automatic centering. Inner Ring Engraving Machine】: Each character height: 1.5mm-2.0mm, jaw rotation angle: 360?, dial diameter is about 5 inches (125mm). Easy to Use】: First, put the ring into the chuck and tighten it, find the characters to be engraved, operate the pen and handle at the same time, draw gently, and then the letters will be successfully engraved on the ring. Wide Application】: This new ring engraving machine is designed for quick and easy engraving inside various rings, which is almost no different from manual engraving. Once you have it, you can create your own customized ring!