Check the listing for details. Robtec 3 in. Steel Knotted Cup Brush. Condition: New. Listed at 9.99 USD. Product OverviewRobtec 3 in. Steel Wire Knotted Cup Brush is a great tool for fast heavy duty cleaning and polishing. It is very efficient in deburring, castings and steel cleaning, rust and scale removing. Use with angle grinders is recommended.Ideal for cleaning and polishing large surfaces like sheet metal and structural steelRemoves rust, burrs, weld scale and moreGreat for pre-paint surface preparationHeavy-duty carbon steel for durability5/8 in. - 11-threaded arborMax RPM: 12,500Wear eye protectionSpecificationsDimensionsProduct Depth (in.)3 inProduct Length (in.)3 inProduct Height (in.)2.25 inProduct Width (in.)3 inDetailsApplicationHeavy DutyReturnable30-DayArbor Size5/8"-11Sanding, Grinding and Polishing Accessory TypeWire Wheel/BrushMaximum Speed (rpm)12500Tools Product TypePower ToolPower Tool Accessory TypeSanding/Grinding/Polishing Accessory