These two die-sets are intended for reloading bottleneck cases, and consist of a Full-Length Sizer Die with an Expander-Decapping Unit, and a Seater Die with Bullet Seater Plug. The Full-Length Sizer Die brings the case to SAAMI minimum cartridge dimensions. This die sizes the outside of the case, de-primes, and expands the neck to accept the bullet.Specifications and Features:Standard 7/8"-14 Thread Proprietary Die Steel Set includes Full-Length Sizing die and Bullet Seating Die Sizing die brings cases to SAAMI minimum cartridge dimensions Cartridge: 6mm ARC