Sinclair Carbide Neck Turning Mandrels are precision ground from solid carbide stock for tighter tolerances and consistent adjustments.
These mandrels are specifically designed for 17 caliber (0.170") cartridges and are sized .002" under bullet diameter for optimal performance.
The mandrels are compatible with Sinclair's NT-4000 turning tool and large caliber mandrels fit the Large Caliber Expander Body and NT-5000 Turning Tool.