Weiler 10025 3/4" x 1/4" x .014" Wire Stem Mounted Hollow-End Knot Wire End Steel Brush (10pk). Use to remove large burrs and heavy contamination, such as multiple layers of rust, scale, paint, or oxindes. For parts requiring high-impact action. For severe applications. For power drills, drill presses, die grinders, and right-angle air die grinders. Specifications: Wire size: .014, Trim length: 7/8", Max RPM: 22,000.