PFERD Universal Line PSF Grinding Wheel, Depressed Center, General-Purpose, Type 27, 9 in Diameter, 1/4 in Thickness, 5/8-11 Arbor, 24 Grit, Coarse Grit Grade, Aluminum Oxide Abrasive, Resin Bond, 6600 rpm Speed, Applicable Materials: Cast Iron, Steel and Stainless Steel, Suitable for: Angle Grinders