Aluminum Oxide Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 60 Overall Diameter 6 in Overall Thickness 1/2 in Compatible Tool Type Cylindrical Grinder Surface Grinder Tool and Cutter Grinder Primary Material Applicationn Steel Tool Steel Specification 32AA60-KVTR Wheel Hardness K Wheel Type Type 1 Maximum Operating Speed 4 140 RPM Series 32AA Grade Medium Bond Type Vitrified Color Blue Item Straight Grinding Wheel Package Quantity 5