Standard pack = 1 piece(s). Type = Non-Woven Wheel ; Abrasive Material = Aluminum Oxide ; Applicable Materials = All Metal ; Arbor/Shank Size = 1/4 Inch ; Center Hole Size = 1/4 Inch ; Density Grade = Hard ; Diameter = 3 Inch ; Face Width = 1/4 Inch ; Grade = Medium ; Maximum Speed = 18000 rpm ; Series = 8 Series ; Thickness = 1/4 Inch ; Type = Heavy Duty ; Wheel Diameter = 3 Inch ;