A core component of the Zero Sizing Die design is the precision-ground, full-length mandrel, crafted to deliver the highest level of consistency in neck tension. These mandrels are interchangeable, providing the reloader with the ability to adjust the neck tension to their exact specifications. Made from 17-4PH Stainless Steel and black nitrided for superior durability, our mandrels ensure smooth, reliable and long-lasting operation, offering exceptional performance and precision throughout the reloading process.