Rotary burrs, also known as rotary files or rotary cutters, are cutting tools made of high-speed steel or tungsten carbide and are used in metalworking, woodworking, and other industrial applications. They have a rotating cutting head that rotates at high speeds, typically in the range of thousands of RPM, and cuts or shapes material as it rotates.

The main uses of rotary burrs include:

1. Deburring: Removing sharp edges or burrs from metal, plastic, or other materials.

2. Shaping: Creating intricate shapes and contours on metal, plastic, or other materials.

3. Surface Finishing: Removing surface imperfections and creating smooth finishes on metal, plastic, or other materials.

4. Weld Preparation: Removing excess material and preparing surfaces for welding.

5. Wood Carving: Creating intricate shapes and designs in wood.

6. Rust and Paint Removal: Removing rust, paint, or other coatings from metal surfaces.

7. Dental and Jewelry Making: Creating intricate shapes and designs in dental and jewelry work.

The type of rotary burr used in a given application will depend on the material being worked with, the required cutting or shaping performance, and the desired finish. Different shapes of rotary burrs are designed for specific applications, such as cylindrical burrs for removing material in tight spaces, spherical burrs for creating smooth finishes, and tapered burrs for reaching into narrow areas.

In conclusion, rotary burrs are versatile cutting tools that have a wide range of uses in metalworking, woodworking, and other industrial applications. They are an important tool for achieving precise cuts and shapes and are widely used in a variety of industries and applications.