The Forney 72782 2-3/4-Inch Knotted Wire Cup Brush is ideal for fast, heavy duty cleaning of large surfaces, removing weld scale, rust and burrs. Designed for use on right angle grinder. 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. 2-3/4-Inch (69.85-mm) by0.020-Inch (0.306-mm) with M10 by 1.25 arbor. Max 12,500-RPM. Claims for warranty must be made within 90 days of the date of purchase. Proof of purchase required. This warranty does not cover any product that has been subject to misuse, neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.