Weiler® Wheel Brush, Narrow Face, 4 in Brush dia, 1/2 in Face Width, 1/2 to 3/8 in Arbor Hole Size, Crimped Filament/Wire, 0.0118 in Filament/Wire dia, Stainless Steel Fill, 7/8 in Trim Length, 12500 rpm Maximum, Unthreaded Arbor Attachment Weiler® 00184 Narrow Face Wheel Brush, 4 in dia Brush, 1/2 in W Face, 0.0118 in dia Crimped Filament/Wire