Weiler's patented construction virtually eliminates knot movement allowing for more controlled brushing and a longer brush life. Each knot is twisted through its own hole and locked into an individual sprocket tooth preventing the knots from moving, and as a result, allowing them to have a stronger striking action on the work surface. Applications: Cleaning rust, scale and oxidation. Deburring. Weld Cleaning. Roughening Surfaces. Edge Blending. Surface Preparation. Sold:1 Each