DCG426N-XJ cordless die grinder from DeWALT. Die grinders are smaller than angle grinders and can be used for grinding, polishing and cutting, depending on what attachment you are using. Their range of performance is limited by the power of their motor and the attachment that you connect.

Type - Body only version grinder, no battery or charger supplied
18V Brushless motor improved performance in demanding applications
3-Step speed dial improved application control
Dual position variable speed switch improved gripping area and speed control
LED nose ring improved workpiece visibility
Mesh guard reduces motor contamination
Durable textured rubber nose increased comfort and control
Airstream directed away from user improved comfort in use
Disc size 38mm
Collet Size 6mm
Overall length 85mm

Die grinders are hand power tools that are usually used for grinding metal. Due to their power and speed, they can be used in various ways such as:
Removing rust
Auto work and repairs
Wood carving