The Lee 204 Ruger Collet Neck Sizing Die is designed to deliver superior accuracy and extended case life by using a steel collet to precisely squeeze the fired case over a mandrel. This process aligns the case neck with precision, significantly reducing run-out for improved consistency and performance. The die sizes only the neck, ensuring minimal stress on the case and it requires no case lubrication for ease of use. This die is recommended for cases that have been fired through your specific firearm, as it ensures the best fit for reloading and prolongs the lifespan of your brass. Perfect for reloaders seeking to maximize accuracy and reliability.