04 in Filament/Wire Diameter, Nylon/Silicon Carbide Fill, 1 in Trim Length, 6000 rpm Maximum, Unthreaded Arbor Attachment.Nylox Wheel Brush, Heavy Duty Narrow Face, 4 in Brush Dia, 5/8 in Face Width, 1/2 to 5/8 in Arbor Hole Size, Crimped/Round Filament/Wire Type, 0..