FOLAI DIY Pen Electric Engraving Tools for Jewellery Making,Metal, Glass with Replaceable Diamond Tip BitsDIY Engraver Pen Electric Engraver Engraving Tools for Jewellery Making,Metal, Glass with Replaceable Diamond Tip Bits High Quality: Japanese electrical machinery has a 21,000 RPM Motor to engrave glass, metal, ceramic and plastic, only need two AAA batteries. Wide Application: Engraves on a wide variety of materials, like metal, stone, plastic, glass, ceramic, wood, leather and more. Personalize and decorate collections, tools, phone cases, goblets,