CGW Depressed Center Wheel, Flat, 5 in Wheel Diameter, 1/8 in Wheel Thickness, Arbor Connector, 24 Grit, Coarse Grade, Aluminum Oxide Abrasive, Wheel Type Number: Type 27, 12250 rpm Maximum, Resin Bond, Applicable Materials: Angle Iron, Iron/Steel Bar, Pipeline, Rail Cutting, Castings, Cast Steel, Gray Cast Iron, Metal Decking and Cable, Wall Studs, High Tensile Steel, Stainless Steel Sheets, Stainless Steel Bars, 5/8-11 Center Hole Thread Size, Wheel Hardness: R, Black Wheel