Astro Pneumatic Tool PRN1 Metric & SAE 3/8" Capacity Pneumatic Rivet Nut Setting Kit Includes 8 mandrels/nosepieces in the following sizes: M4, M5, M6, M8, M10, 1/4", 5/16", 3/8" Instantly set rivet nuts with the pull of the trigger Quickly un-thread set rivet nuts by operating free spinning rear wheel 2680lbs of instant air-hydraulic pulling force Max capacity: M10 (3/8") steel and aluminum rivet nuts, M6 (1/4") stainless rivet nut