The Rivet Nut Installation Tool is to be used with rivet nuts. This tool includes 14 mandrels (Metric and Imperial; left hand and right hand thread), wrench, storage case and installation instructions. It features a scale identification, adjustable stroke and comfortable hand grips.• Rivet Nut Installation Tool Kit Components • Wrench • Mandrel – 1/4”-28 RH • Mandrel – 1/4”-28 LH • Mandrel – 3/16” 10-24 RH • Mandrel – 1/4”-20 RH • Mandrel – 5/16”-18 RH • Mandrel – 3/8”-16 RH • Mandrel – 1/4”-20 LH • Mandrel – M3 x .5 • Mandrel – M4 x .7 • Mandrel – M5 x .8 • Mandrel – M6 x 1.0 • Mandrel – M8 x 1.25 • Mandrel – M10 x 1.5 • Mandrel – M12 x 1.75