Full-length die sets for bottleneck cases include two dies. The Full-Length (FL) resizing die features a decapping rod assembly with a neck expander (size button), which resizes the entire case while ensuring the proper neck tension for bullet seating and decapping the spent primer. The seating die (ST) includes a bullet guide, a built-in crimp ring and the appropriate seating plug, allowing for precise bullet placement and crimping. Together, these dies provide the necessary tools for resizing cases and seating bullets accurately, ensuring consistent performance in your reloading process.