Depressed Center Grinding Wheel, Abrasive Material Aluminum Oxide, Connector Size 7/8 in, Connector Type Unthreaded Hole, Grit 24, Overall Diameter 7 in, Overall Thickness 0.25 in, Primary Material Application Cast Iron, Concrete, Masonry, Compatible Tool Type Angle Grinder, Series A24R, Wheel Type Type 27, Maximum Operating Speed 8,700 RPM, Grade Extra Coarse