The Forney 72871 6-Inch Industrial Pro Twist Knot Cup Brush is a premium brush used for heavy duty cleaning of metal surfaces. Used to remove rust, scale, paint or other adherences on flat or irregular surfaces. Made from high carbon tempered steel and each tuft is perfectly positioned and set for perfect balance and optimum performance. Patented nut design has gripping points and raised nut making it easier to tighten and loosen on and off angle grinders. Forney Industries is one of America's longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5,000 products for the hardware, automotive, farm and ranch and do-it-yourself markets. 6-Inch (152.4-mm) by .020-Inch (0.508-mm) with 5/8-Inch - 11 threaded arbor. Max 6,000-RPM. Proof of purchase required. neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.