This two-die set is for bottleneck cases to be fired in bolt-action rifles only specifically, cases fired out of a specific rifle and neck-sized to go back into the same rifle.The set consists of a neck sizer die with an expander-decapping unit, and a seater die with bullet seater plug.The neck sizer die resizes the neck only (it doesn t touch the shoulder or body) and de-primes.Included is a seater die has that has a built-in roll crimper to secure the bullet at the same time it's seated.Type: Neck Sizer Die SetCaliber: 308 WinDie Type: Neck SizerIn Set: 2