The Forney 72266 Twist Knott Wire End Brush is stem mounted and designed for easy access into narrow holes and confined areas. Twist Knot for heavy duty applications. Removes rust, scale and paint in hard to reach areas. Forney Industries is one of Americas 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. 3/4-Inch (19. 05 mm) by . 020-Inch (. 51 mm) with 1/4-Inch (6. 35 mm) shank. 20, 000 Max RPM. Claims for must be made within 90 days of the date of purchase. Proof of purchase required. This 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.