The Forney 60050 1-Inch by 1-Inch Cylindrical Mounted Grinding Wheel is shank mounted and made from durable, high-grade aluminum oxide. Perfect for grinding, polishing or deburring ferrous metals or other hard surfaces. Especially useful where larger wheels will not fit or where small abrasive wheels wear out too quickly. 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. 1-Inch (25.4 mm) by 1-Inch (25.4 mm) with 1/4-Inch (6.35) shank mounted grinding wheel. For use on 1/4-Inch (6.35 mm) chuck high speed drills. 3,450 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.