The mandrels are precision-made from high-grade stainless steel and designed to fit both the NT-3000 and NT-1000 neck turning tools, as well as most older models.
Expander mandrels are 0.001" larger than turning mandrels, ensuring a perfect fit for the neck turning process, leading to more precision and ease.
These mandrels can also be used for "necking" cases up to the next caliber with the NT-EXP Expander Body.