The Lee 7mm PRC Collet Neck Sizing Die utilizes a steel collet to gently squeeze the fired case onto a precision mandrel, ensuring the case neck is perfectly aligned while minimizing runout. This results in superior accuracy and extends the life of your cases by sizing only the neck, leaving the rest of the case unaffected. The die requires no lubrication, streamlining the reloading process. It is specifically designed for use with cases that have been fired through your firearm, providing the best results for consistent, high-performance reloading.