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 Applicationn Cast Iron Stainless Steel Steel Compatible Tool Type Angle Grinder Series Gemini Wheel Type Type 27 Maximum Operating Speed 8 600 RPM Grade Extra Coarse