The Forney 72732 3 in. crimped wire cup brushes are ideal for light duty cleaning action. 3 in. (76.2 mm) x 0.008 in. (0.203 mm) fine wire cup brush with 1/4 in. (6.35 mm) hex shank. MAX 6,000 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.