Meet your needs at great extent: This manicure and pedicure kit includes 5 types of drills, designed for diverse use - remove callus, clean, grind, and polish your nails One-hand operation: Length about 16.5cm(6.50in). Allows your handle it with only one hand Portable: Lightweight and portable nail drill kit for travel, business and other outdoor activities Replaceable: The drill is replaceable and please poke the drill into the nail polish machine firmly in case of the drill's ejecting out Convenient: Powered by 2 AA batteries, no need to looking for power supply at outsides, however the batteries are not included.