Aluminum Oxide Connector Size 1/2 in Connector Type Unthreaded Hole Grit 100 Overall Diameter 4 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 38A100-IVBE Wheel Hardness I Wheel Type Type 1 Maximum Operating Speed 8 120 RPM Series 38A Grade Fine Bond Type Vitrified Color White Item Straight Grinding Wheel Package Quantity 5