Forney 60025 Mounted Grinding Point with 1/4-Inch Shank, 1-1/4-Inch-by-1-Inch Shank mounted points and grinding wheels are made from durable high grade 60 grit aluminum oxide Perfect for grinding, polishing or deburring ferrous metals Use with 1/4-Inch chuck for high speed drills Especially useful where larger wheels will not fit or where small abrasive wheels wear out too quickly Max RPM is 38,000