Feature: 1. Equipped with 9pcs grinding bits of different specifications to meet different needs. 2. Large capacity rechargeable battery, stable and safer output. 3. Fine craftsmanship motor, making it output strong power stably, and can work continuously for a long time with high concentricity. 4. Three kinds of speed adjustment, apply different degrees of polish needs. 5. Fine quality steel body, increase the weight and hold it firmly. Specification: Suitable for various chip grinding, motherboards cutting, brackets cutting, screw removal, etc. Features: Equipped with 9pcs grinding bits of different specifications to meet different needs. Large capacity rechargeable battery, stable and safer output. Fine craftsmanship motor, making it output strong power stably, and can work continuously for a long time with high concentricity. Three kinds of speed adjustment, apply different degrees of polish needs. Fine quality steel body, increase the weight and hold it firmly. Specifications: Color: blue Material: metal Rotating speed: 37000rpm/min Voltage: 3.6V Clamping diameter: 2.35mm Battery: 3.7V, 280mAh Item size: 155 * 16 * 16mm / 6.1 * 0.6 * 0.6in Package size: 142 * 33 * 20mm / 5.6 * 1.3 * 0.8in Package weight: 101g / 3.6ounce . Package List: 1 * Engraving Pen 1 * USB Cable 9 * Grinding Bits