Electric Nail Drills Kit 20000 RPM Adjustable Rotate Speed USB Portable Nail File Machine Set with Replaceable Grinding Bits Features: Professional Nail Drills: Used for sanding, polishing, removing nails glue, removing calluses and dead skin, ect. Adjustable Speed: With speed adjustment gear, you can adjust the rotation speed freely (0-20000 RPM). Forward & Reverse Switching: The direction of the rotating bit is adjustable, you can choose forward or reverse. Replaceable Grind Bits: Comes with 11 replaceable grinding bits, easy to change without the tools.  Convenient Carrying: Compact size, can be put into your handbag easily, convenient to carry. Long-lasting e: Fine workmanship and superier material, provides comfortable hand feel and long service life. Specifications: Material: All Aluminum Body + Pure Copper Motor Color: Black, Gold, Pink, Silver (Optional) Speed: 0-20000 RPM Nail Drill Pen Size: 130 * 20mm / 5.12 * 0.79in Package Size: 130 * 60 * 40mm / 5.12 * 2.36 * 1.57in Package Weight: 70g / 2.47ounces Note:  1.There are different kinds of adapter optional. Please choose the one suitable for your country. 2.Due to the different display screen and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Package List: 1 * Nail Grinding Pen 6 * Metal Grinding Bits 5 * Quartz Grinding Bits 1 * Powers Cable 1 * User Manual