This inner ring engraving machine is designed for fine engraving, with a character height range of 1.5mm-2.0mm, your jewelry designs are clearly rendered. Equipped with a double-sided knob and a 125mm diameter, this jewelry ring engraving machine offers easy adjustment and precise control, making it ideal for both beginners and experienced jewelers. Measuring 150*210*378mm, the inner ring engraving machine easily integrates into any workspace, providing a compact solution without sacrificing functionality. The 360° jaw rotation angle allows you to engrave intricate patterns from all angles, flexibly creating bespoke pieces to suit your client's preferences. This engraving machine comes with standard letter blocks, allowing you to easily personalize rings and elevate your jewelry products with custom engravings.