Aluminum Oxide Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 60 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 32A60-JVBE Wheel Hardness J Wheel Type Type 1 Maximum Operating Speed 3 600 RPM Series 32A Grade Medium Bond Type Vitrified Color Purple Item Straight Grinding Wheel