The mandrels are precision-made from high-grade stainless steel and are designed to fit both SINCLAIR INTERNATIONAL NT-3000 and NT-1000 neck turning tools.
Expander mandrels are .001" larger than turning mandrels, ensuring a perfect fit for the neck turning process, making it more precise and easier.
These mandrels can also be used to "neck" cases up to the next caliber with the NT-EXP Expander Body.