Features High Accuracy Brass Clamp Head: Our mini electric engraving pen designed with a brass clamp head for high concentricity and stable clamping. 2.35 Shank Diameter Grinding Bit: The mini electric engraver is integrally firm and can be used for 2.35 shank diameter grinding bit. Comfortable Grip: The electric engraver grinder feels good to use and comfortable to hold during actual work, with 10W power. Wide Range of Uses: The electric grinder pen has a 380 mAh battery and is suitable for engraving sporting goods, toys, chargers and delicate jewelry and watches. Suitable Materials: Electric engraver grinder pen can be suitable for glass, metal, wood, plastic, leather, jewelry, etc. Specification: Item Type: Mini Electric Engraving Pen Material: Stainless Steel, Brass Clamp: 2.35 Clamp Head Depth: Approx. 25mm / 1in 3 Gears Speed: 10000, 15000, 20000r/min Power: 10W Battery Capacity: 3.7V Lithium Battery x 1, 380 MAh (Shipped With Built In Battery) Charging Input Voltage: 5V, 2A Package List: 1 x Engraving Pen 1 x Charging Cord 2 x Engraving Needle 1 x Instruction Manual Package List 1 x Engraving Pen 1 x Charging Cord 2 x Engraving Needle 1 x Instruction Manual