Aluminum Oxide Connector Size 1 1/4 in Connector Type Unthreaded Hole Grit 120 Overall Diameter 7 in Overall Thickness 1/4 in Compatible Tool Type Cylindrical Grinder Surface Grinder Tool and Cutter Grinder Primary Material Applicationn Nickel Alloy Steel Tool Steel Specification 38A120-KVBE Wheel Hardness K Wheel Type Type 1 Maximum Operating Speed 3 600 RPM Series 38A Grade Fine Bond Type Vitrified Color White Item Straight Grinding Wheel Package Quantity 5