Made from durable, high-grade 60 grit aluminum oxide. Perfect for grinding, polishing or deburring ferrous metals or other hard surfaces. Please enter your postal code to check availability. Shank mounted points and 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" (6.35 millimeters) chuck high-speed drills. Especially useful where larger wheels will not fit or where small abrasive wheels wear out too quickly. Product Specifications: Size: 1" x 1" Shape: Cylindrical (W220) Maximum revolutions per minute (RPM): 30,370 Product comes in carded packaging Bulk packaging version is Forney Industries ITEM# 72472 Tool type: For use with 1/4" (6.35 millimeters) chuck high-speed drill