-Off & Grinding Wheel, Abrasive Material Aluminum Oxide, Connector Size 5/8 In.-11, Connector Type Threaded Hole, Grit 24, Overall Diameter 7 in, Overall Thickness 0.125 in, Primary Material Applicationn Cast Iron, Steel, Compatible Tool Type Angle Grinder, Series A24R Pipeline, Wheel Type Type 27, Maximum Operating Speed 8,500 RPM, Grade Extra Coarse