Rivet Nut Tool Kit, Number of Pieces 4, Number of Rivet Nuts 0, Tool Types Included Rivet Nut Installation Tool, Thread Size M3, M4, M5, M6, Rivet Nut Material Aluminum; Steel, Finish Plain, Mandrel Sizes Included M3, M4, M5, M6, System of Measurement Metric, Includes (4) Mandrels, Molded Plastic Case, Rivet Nut Types Included Rivet Nut