The Forney 72489 1 inch X 1/2 inch cylindrical mounted rotary file with rounded end is shank mounted and are tough, rugged tools made from special tempered steel. They are the perfect product to remove material in hard to reach places. Ideal for powered hand drills, to shape and smooth wood. 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 & ranch and do-it-yourself markets. For more information, visit www.forneyind.com. If you've got metal working questions, we've got answers. We're committed to your success regardless of location size or needs. Please contact our team at www.customerserviceatforneyind.com. 1 inch (25.4 mm) x 1/2 inch (12.7 mm) with 1/4 inch (6.35 mm) shank mounted cylindrical rotary file with rounded end. 2,500 Max 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.