The Sinclair TiN Expander Mandrels offer increased abrasion resistance and lubricity over standard steel mandrels due to the Titanium Nitride coating.
These mandrels are specifically designed to be 0.001" under bullet diameter for expanding the necks of brass prior to neck turning and setting neck tension.
The 17 Caliber TiN Expander Mandrel has a diameter of 0.171 inches and is a product of SINCLAIR INTERNATIONAL, suitable for those not requiring the upgrade to Carbide Mandrels.