Sinclair stainless steel neck turning mandrels are made from high-grade stainless steel and are designed with precision for cartridges from 17 to 50 caliber.
The 22 caliber mandrel is sized .002 inches under bullet diameter for accurate turning, with the expander mandrels being .001 inch under bullet diameter.
Carbide mandrels offer tighter tolerances, being ground to .002 inches under bullet diameter, which provides more consistent adjustments when used with Sinclair's NT-4000 turning tool.