6' Diameter, Threaded Hole, Steel, 5/8-11' Arbor, 6" Diameter, 5/8-11" Arbor, Type stainless steel and bronze wire. 。 。 。. Threaded Hole, Stringer Knotted, Steel, Stringer Knotted, Weiler Dualife Narrow Face Wire Wheel Brush. 0.020" Wire Diameter, 12500 rpm: Abrasive Wheel Brushes: Industrial & Scientific. Weiler Dualife Narrow Face Wire Wheel Brush, 12500 rpm: Abrasive Wheel Brushes: Industrial & Scientific. The individual knot wire tufts of a knot wheel provide minimal flexibility for more aggressive brushing action. 's knot wheels are constructed with an internal steel plate that has equally spaced individual holes around the perimeter. Wire is inserted through each hole and twisted into a knot. Each hole has precisely the same wire count. 1-1/8' Bristle Length, 1-1/8" Bristle Length, 3/16" Brush Face Width. 3/16' Brush Face Width, reduces operator fatigue and increases brush life. Knot wire wheels are available in heat-treated steel. 0.020' Wire Diameter, thereby assuring perfect balance. This eliminates vibration.