The NECK TENSION GAGE TOOL is used to measure and ensure consistent neck tension in reloaded rifle brass, which is crucial for bullet release consistency.
It allows reloaders to check for the presence of a "donut" at the neck-shoulder junction and to determine the optimal inside neck diameter before seating bullets.
The tool comes with four stepped diameters for measuring, and the kit includes gages for five different calibers, making it versatile for various reloading needs.