Aluminum Oxide Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 80 Overall Diameter 7 in Overall Thickness 1/4 in Compatible Tool Type Cylindrical Grinder Surface Grinder Tool and Cutter Grinder Primary Material Applicationn Steel Tool Steel Specification 32AA80-KVTR Wheel Hardness K Wheel Type Type 1 Maximum Operating Speed 3 600 RPM Series 32AA Grade Medium Bond Type Vitrified Color Blue Item Straight Grinding Wheel Package Quantity 5