It's a metal-bonded tool with diamond segments on a wheel body.
Typically used on concrete grinders for materials like concrete, granite, and marble.
Different segment designs exist for various tasks, from heavy-duty grinding to removing coatings.
Double-row versions are for general grinding, while single-row are more aggressive.
Specialized types like PCD cup wheels are available for specific applications.
The size in the image appears to be 9 inches, as indicated on the product label.
It is designed for efficient material removal and can have a long lifespan depending on usage