【High quality material】 Made of high quality material with Japanese motor. Efficient and durable. 【Fast & precise operation】 12,000rpm chuck speed; Pen Head Diameter: 2.35mm. Even though small size owns the big power, The cordless rotary tool has low torque and only suitable for light grinding, engraving, etc 【Electric】 powered by 4 x AA type batteries (not included in the package). Easy to handle & strong riparmia. 【Widely Used】 Applications include engraving tools, sporting goods, toys, phone chargers and delicate personalization of jewelry, watches and glassware (Perfect gift for birthday, holiday, Christmas and other special occasions ) Electric Engraver Pen with Diamond Tip for Bijouxv Ceramic Plastic Features: Size: Length: 16 * 2 cm Product weight: 102 g Power supply: 4 AA batteries (not included) Chuck Speed: 12.000RPM Material: Artificial diamond and plastic The package includes 1 * Engraving Pen