Features 1、Easy to Operate: Our metal engraving tools are easy to operate, especially for beginners, 2、Applicability: Three level speed regulation, can be used to make key chains, DIY necklaces. 3、Body Material: Made of high quality metal, durable, long term use without deformation. 4、Portable: These portable and compact etching pens are easy to carry around, allowing you to enjoy easy hand drill jewelry making time. 5、Multipurpose: This miniature electric grinder is mainly used for all kinds of stone, wood, almond core, PCB circuit board, plastic egg detail engraving, grinding, or for rust removal and trimming of small workpieces, nail polish; it can also be used in stainless steel, It can be carved and engraved on glass, ceramics and other planes, and the grinding and engraving are very favorable. Specification Item Type: Engraving Pen Product Material: Metal, Plastic Adapt To Grinding Head Shank Diameter: Approx.2.35mm / 0.09in Chuck Depth: Approx.25mm / 1in Speed: 5000, 10000, 18000 Three Level Power: 8W Use Time: The Third Gear Runs For More Than 1 Hour With No Load. If You Need To Use It For A Long Time, You Can Use It While Charging Battery Type: Lithium Battery (Shipped With Built in Battery) Battery Capacity: 300mAh Charging: 80% Full In 30 Minutes, Full In 60 Minutes Package List 1 x Host 1 x Charging Cable 1 x Drill Bit 1.0mm 1 x Drill Bit 1.5mm 1 x Slice 22mm 1 x Slice 25mm 1 x Slice 32mm 1 x Slicing Connecting Rod 1 x Metal Grinding Head 30 x Grinding Needle 1 x Grinding Needle Storage Box