6 optional standard metal bits heads and 6 sanding bands, easy to change, no need tools. You can choose the corresponding bits and bands according to the specific situation. It is quiet and smooth, very low vibration design for comfort grip. Low noise, heat and vibration for smooth and long-time operation. And it is easy for you to replace the bits. This is pen shape small mini electric pen shape drill polishing machine with adjustable speed utility of this Drill is for nail, paper, card board works & light soft.