Full-length die sets for bottleneck cases consist of two dies. The Full-Length (FL) resizing die contains a decapping rod assembly with a neck expander (size button), which resizes the entire case and removes the spent primer, while ensuring the proper neck tension for bullet seating. The seating die (ST) features a bullet guide, a built-in crimp ring and the appropriate seating plug, allowing for precise bullet placement and reliable crimping. These two dies work together to provide accurate resizing and bullet seating, ensuring optimal performance in your reloading process.