The Forney 72731 3 in. crimped wire cup brushes are ideal for light duty cleaning action. 3 in. (76.2 mm) x 0.012 in. (0.305 mm) coarse 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.