Description: CORDLESS ELECTRIC GRINDER: Wireless engraving pen mini nail polisher set, the lowest speed will let you polishing your nail in safe, the highest speed are also working on metal carving. FEATURES: USB charging, low noise work. 3 speed options 5000-10000-18000, the body is made of alloy material, good heat dissipation, making your artwork DIY creation. VARIOUS GRINDING BITS: 30Pcs different polishing bits perfect for carving, polishing, cutting and polishing of multiple materials, and enabling you to achieve different crafting work efficiently. EASY TO CARRY: Portable and lightweight design, easy to handle and carry it anywhere. WIDE APPLICATION: Our engraver tools are easy to operate, work on necklace keychain, metal, glass, ceramic, leather, wood,jewelry,stone or statue. Specification: Material: Plastic, Metal Polisher Pen Length:125mm/4.92inch Diameter:16mm/0.63inch Package Includes: 1x Electric Engraving Pen 1x Grinding Head 30x Grinding Bits 6x Grinding Disc 2x Linkage Rod 2x Drill Head 1x USB Cable