3.13 Sizes of Mandrels and Rivet Nuts: Our rivet nut gun kit provides versatility with 13 pcs of mandrels and 186 pcs rivet nuts. The nuts include 20 pcs each for 6 sizes: M3, M4, 10-24, M5, M6, 1/4-20; 10 pcs each for 6 sizes: 8-32, 5/16-18, M8, 3/8-16, M10, M12; and 6 pcs for 1 size: 1/2-13.
