The Sinclair TiN Expander Mandrels offer increased abrasion resistance and lubricity due to the Titanium Nitride coating, compared to standard steel mandrels.
These mandrels are designed to be 0.001" under bullet diameter for precise neck expansion before neck turning, suitable for calibers of 7mm.
They are an intermediate option between Stainless Steel and Carbide Mandrels for users seeking durability without needing the highest-end upgrade.