The Sinclair TiN Expander Mandrels offer increased lubricity and abrasion resistance due to the Titanium Nitride coating, compared to standard steel mandrels.
These mandrels are designed for expanding the necks of brass prior to neck turning and can also be used to set neck tension.
The mandrels are made to 0.001" under bullet diameter, specifically for 8mm caliber with a diameter of 0.322 inches.