Felton’s, made in Canada #187 Knotted wire end brush is the worldwide leader in drill thread cleaning applications. Flaring of the knots allows for contouring od corners, edges and surfaces. Idealb for flash, scale, rust, corrosion, and paint removal, etc. Highly used in the metal fabrication industry. For optimal results, spin at 18,000 RPM or higher. High grade USA stainless steel wire, ideal for non-contamination on SS material.