Heavy Duty and Long-lasting carbon steel wires in knotted design in 1/2 inch thick knots to provide extra aggressiveness and material removing power on all metal surfaces - Includes three knotted (twisted) wire brush types, all of which are mounted on a universal 1/4-inch hex shank and fit all drills and impact drivers. The first type is a 3 inch Wire wheel brush with a circular shape ideal to getting into corners, edges and vertical cuts - The second type is 3 inch Wire cup brush with a circular cup shape is ideal for getting into wider flat surfaces as well as round profiled surfaces - The third type is a 1 inch Wire End brush with a narrow end profile is ideal for getting into crevices and hard-to-reach spots - Ultimate Versatility in the Metalworking shop: The knotted wire bristles are ideal for removing rust, paint, and other debris from metal surfaces. Cleaning up welds, Deburring cut edges