FlexOvit® HP™ Depressed Center Wheel, Fast Grind, 6 in Wheel dia, 1/4 in Wheel Thickness, 7/8 in Center Hole, Arbor Connector, A30S Grit, Super Fine Grade, Aluminum Oxide Abrasive, Wheel Type Number: Type 27, 10000 rpm Maximum, Resin Bond, Applicable Materials: Metal and Stainless Steel, Wheel Hardness: S, Specifications Met: ANSI B7.1. FlexOvit® HP™ A3236 Fast Grind Depressed Center Wheel, 6 in dia x 1/4 in Thick, 7/8 in Center Hole, A30S Grit