Weiler 4″ Knot Wire Bevel Brush provides heavy-duty brushing action with some flexibility for demanding cleaning applications on somewhat irregular surfaces. Ideal for cleaning filet welds and into corners. 5/8″-11 nut for use on right angle grinders. Saucer-shaped radial wheels which provide a heavy-duty brushing action with some flexibility. Ideal for cleaning filet welds and into corners. . . .