Weiler 4″ Standard Twist Knot Wire Wheel Brush provides a heavy-duty brushing action with some flexibility for demanding deburring cleaning and surface preparation applications on somewhat irregular surfaces. 3/8″-24 nut for use on right angle grinders. Provide heavy duty brushing action with some flexibility. Ideal for deburring and demanding cleaning applications on somewhat irregular surfaces. Knot wire wheels with a threaded nut are intended for use primarily on small and large right angle grinders. Featuring Weiler’s individual knot hole construction, these radial brushes are available in heat-treated steel, type 302 stainless steel and bronze wire for use in a wide variety of applications. .