Weiler® 4 in 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. Featuring Weiler® 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. 1/2 to 3/8 in arbor hole for use on bench/pedestal grinder, die grinder, right angle die grinder and straight grinders. Weiler® Wheel Brush, 4 in Diameter Brush, 1/2 in Face Width, 1/2 to 3/8 in Arbor Hole, Standard Twist Knot Filament/Wire, 0.0118 in Dia Filament/Wire, Steel Fill, 7/8 in Trim Length, 20000 RPM Maximum