The Forney 60055 Mounted Grinding Wheel is specially designed for use with 1/4" (6.35 millimeters) chuck power drills. This powerful yet compact wheel is made from durable high-grade 60 grit aluminum oxide and reaches up to 3,450 RPM, perfect for grinding, polishing, and deburring ferrous metals and other hard surfaces. Its carded packaging makes it great for any kind of project.