The Forney 2 inch x 1/2 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. For use with 1/4 in. (6.35 mm) chuck high-speed drillsRated to 3450 RPMShank mounted grinding wheels are made from durable, high-grade 60 grit aluminum oxidePerfect for grinding, polishing or deburring ferrous metals or other hard surfacesEspecially useful where larger wheels will not fit or where small abrasive wheels wear out too quickly