Mounted grinding wheel, 2-1/2" x 1/2" (carded). max rpm: 3,450. shank Mounted grinding wheels are made from durable, high-grade 60 grit aluminum oxide. perfect for grinding, polishing or deburring ferrous metals or other hard surfaces. for use with 1/4" (6.35mm) chuck high-speed drills. especially useful where larger wheels will not fit or where small abrasive wheels wear out too quickly.wheels wear out too quickly

• Mounted Grinding Wheel, 2-1/2"x1/2"
• Fits 1/4" chuck high-speed drills
• Perfect for grinding, polishing or deburring ferrous metals or other hard surfaces