The Forney 60052 2-inch by 1/4-Inch 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. 2-Inch (50.8 mm) by 1/4-Inch (6.35 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.