A pneumatic die grinder is a tool powered by compressed air, designed for grinding, polishing, and shaping materials like metal and plastic. It features a rotating spindle that holds various attachments, such as grinding stones or sanding discs, allowing for versatile applications in workshops and manufacturing. These grinders are lightweight and easy to maneuver, making them ideal for detailed work in tight spaces. They are commonly used in automotive repair, metal fabrication, and woodworking, providing a high-speed solution for finishing tasks that require precision and control.