Astro Pneumatic Tool PRN8M ONYX Pneumatic Rivet Nut Setting Gun with Quick-Change 6mm & 8mm Mandrels M6 and M8 mandrels included Dial in regulator settings for specific rivet nut sizes and compositions 8mm rivet nut capacity Forward and reverse actions for quick operation This is a high production tool and mandrel screws are consumable wear items, contact Astro to stock inexpensive mandrel replacements