metabo® Depressed Center Wheel, General Purpose, Series: Original Long Life Cutting & Grinding, 4-1/2 in Wheel Diameter, 1/8 in Wheel, Thread Connector, A24T Grit, Coarse Grade, Aluminum Oxide Abrasive, Wheel Type Number: Type 27, 13300 rpm Maximum, Resin Bond, Applicable Materials: Steel, Stainless Steel and Ferrous Metals, 5/8-11 Center Hole Thread, Wheel Hardness: T, Black Wheel, Reinforced: Yes