3", carbon steel, knotted wire, single row cup brush, x-lock arbor, offers a faster, fixed mount & high-quality materials, snap-on mounting & grinder lever wheel release for 5x faster change-out, wheel mounts properly without the need for a spanner wrench or flange nuts, no easy to lose parts, ideal for removing weld scale, burrs & corrosion, precision balanced cup virtually eliminates vibration, application focused designed specifically for use with small angle grinder, quality manufacturing features high-quality materials for durability.