Aluminum Oxide Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 46 Overall Diameter 7 in Overall Thickness 1/2 in Compatible Tool Type Cylindrical Grinder Surface Grinder Tool and Cutter Grinder Primary Material Applicationn Aluminum Cast Iron Stainless Steel Steel Tool Steel Specification 32A46-HVBEP Wheel Hardness H Wheel Type Type 1 Maximum Operating Speed 3 600 RPM Series 32A Grade Coarse Bond Type Vitrified Color Purple Item Straight Grinding Wheel