Depressed Center Grinding Wheel Abrasive Material Silicon Carbide Connector Size 7/8 in Connector Type Unthreaded Hole Grit 24 Overall Diameter 4 1/2 in Overall Thickness 0.25 in Primary Material Applicationn Cast Iron Concrete Masonry Compatible Tool Type Angle Grinder Series C24R Wheel Type Type 27 Maximum Operating Speed 13 300 RPM Grade Extra Coarse