Includes four sizes: 330x10mm, 457x13mm, and 520x20mm, perfect for various grinding tasks. Made from zirconia material, providing excellent self-sharpening and wear resistance for long-lasting performance. Ideal for grinding a wide range of materials including non-alloy steel, alloy steel, stainless steel, aluminum, copper, and wood. Features high heat dissipation performance, making it suitable for high-temperature tempering steel applications. Butt joint devise ensures a secure fit on mini belt grinders, enhancing efficiency and precision in your projects.