This 2-Die Set is designed for reloading bottleneck cases and includes a Full-Length Sizer Die with an Expander-Decapping Unit and a Seater Die with a Bullet Seater Plug. The Full-Length Sizer Die ensures that the case is resized to the SAAMI minimum cartridge dimensions. It resizes the outside of the case, removes the spent primer (de-primes) and expands the neck to allow the bullet to fit properly. Additionally, the die is equipped with vents to prevent any case damage caused by trapped air or excess lubricant. The headspace is held to strict tolerances, preventing any alteration in the case body length during the resizing process. The included Seater Die also features a built-in roll crimper, which securely crimps the bullet while seating it. This set is perfect for achieving precise, reliable reloading results.