Vortec Pro® Cut-Off Wheel, Type 27, 5 in Wheel Dia, 1/4 in, 7/8 in Center Hole, Arbor Connector, 24 Grit, Coarse Grade, Aluminum Oxide Abrasive, Wheel Type Number: Type 27, 12200 rpm Maximum, Resin Bond, Applicable Materials: Steel, Iron and other Ferrous Metals, Wheel Hardness: R, Reinforced: No