Walter Surface Technologies FLEXCUT Depressed Center Wheel, Premium Performance, 6 in Wheel Diameter, 1/8 in Wheel, Thread Connector, 24 Grit, Extra Coarse Grade, Aluminum Oxide Abrasive, Wheel Type Number: Type 28, 10200 rpm Maximum, Resinoid Bond, Applicable Materials: Aluminum, other Non-Ferrous Metals, Steel and Stainless Steel, 5/8-11 Center Hole Thread, Specifications Met: ANSI B7.1, EN 12413