The Sinclair International 50 Caliber Stainless Expander Mandrel is made from high-grade stainless steel, offering precision for neck turning and expanding tasks.
Designed with tight tolerances, the mandrel is .001" under bullet diameter for precise expansions, and is compatible with the Large Caliber Expander Body and NT-5000 Turning Tool.
Additional carbide mandrels are available, ground to .002" under bullet diameter for even tighter tolerances, enhancing the consistency of adjustments on the NT-4000 turning tool.