Standard pack = 1 piece(s). Type = Face Wheel ; Arbor Hole Size = 1/2 to 3/8 Inch ; Arbor/Shank Size = 1/2 to 3/8 Inch ; Attachment Type = Unthreaded Arbor ; Brush Diameter = 4 Inch ; Brush Width = 1/2 Inch ; Face Width = 1/2 Inch ; Filament/Wire Diameter = 0.022 Inch ; Filament/Wire Type = Crimped/Round ; Fill Material = Nylon/Silicon Carbide ; Maximum Speed = 6000 rpm ; Trim Length = 7/8 Inch ; Type = Narrow Face ; Wire Diameter = 0.022 Inch ; Wire Material = Silicon Carbide ; Wire Type = Crimped ;