The Knot Wheel Brush is suitable for use on hand-held angle grinders, for processing weld seams, and for removing scale, rust, paint, slag, and concrete residue. The brush with steel wire is suitable for processing large steel surfaces. The aggressiveness is hard. The knot wheel brush is suitable for professional use. The left-right knotted brush is usually more aggressive and ideal for processing corners and edges. The high-grade “Made in Germany” quality is often used in the metalworking industry, in craft businesses, car workshops, and by staircase, railing, and container builders.