FlexOvit® High Performance™ Grinding Wheel, 2 in Wheel dia, 3/8 in Wheel Thickness, 3/8 in Center Hole, A36Q Grit, Aluminum Oxide Abrasive, 27120 RPM Maximum, Applicable Materials: Alloy, Metals and Stainless Steel, Wheel Type Number: Type 1. FlexOvit® High Performance™ F0169 Grinding Wheel, 2 in dia x 3/8 in Thick, 3/8 in Center Hole, A36Q Grit, Aluminum Oxide Abrasive