FOLAI Electric Engraving Engraver Pen Carve Tool for DIY Jewellery Jewelry Metal Glass - (Cordless Precision Engraver with Diamond Tip Bit - High Quality: 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, dog tags even valuables, and carved belongings for a unique touch. - Easy to Use: Hold the engrave like a pen with your thumb over the control button with a standard 3/32-inch engraving diamond tip bit and safe fingertip controlled on/off switch. - Engraving Diamond Tip Bit: Using a standard 3/32-inch engraving diamond tip bit and safe fingertip controlled on/off switch. - No cord. No bulky engraver. No hand-strain. Our lightweight, aluminum frame & ergonomic tri-lobal grip means comfortable engraving, anywhere.