Aluminum Oxide Connector Size 3 in Connector Type Unthreaded Hole Grit 60 Overall Diameter 12 in Overall Thickness 1 in Compatible Tool Type Cylindrical Grinder Surface Grinder Tool and Cutter Grinder Primary Material Applicationn Nickel Alloy Steel Tool Steel Specification 38A60-IVBE Wheel Hardness I Wheel Type Type 1 Maximum Operating Speed 2 070 RPM Series 38A Grade Medium Bond Type Vitrified Color White Item Straight Grinding Wheel