Aluminum Oxide Connector Size 5/8 in Connector Type Unthreaded Hole Grit 60 Overall Diameter 6 in Overall Thickness 3/4 in Compatible Tool Type Cylindrical Grinder Surface Grinder Tool and Cutter Grinder Primary Material Applicationn Nickel Alloy Steel Tool Steel Specification 38A60-KVBE Wheel Hardness K Wheel Type Type 1 Maximum Operating Speed 4 140 RPM Series 38A Grade Medium Bond Type Vitrified Color White Item Straight Grinding Wheel Package Quantity 5