Aluminum Oxide Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 80 Overall Diameter 7 in Overall Thickness 1/4 in Compatible Tool Type Cylindrical Grinder Surface Grinder Tool and Cutter Grinder Primary Material Applicationn Aluminum Cast Iron Stainless Steel Steel Tool Steel Specification 32A80-IVBE Wheel Hardness I Wheel Type Type 1 Maximum Operating Speed 3 600 RPM Series 32A Grade Medium Bond Type Vitrified Color Purple Item Straight Grinding Wheel