The Forney 72760 4-Inch Stringer Bead Twist Knot Wire Wheel Brush is extra narrow to clean pipe welds between passes and other applications where a narrow brush face is necessary to do the job. 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. 4-Inch (101.6-mm) by0.020 (0.306-mm) with 5/8-Inch - 11 threaded arbor. Max 20,000-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. Max 20,000-RPM 4-Inch (100-mm)