Redding 3-Die Sets contain a full length sizing die, expander die, and bullet seating die. The full length sizing die features a decapping rod assembly with neck expander. The expander die includes a neck expanding plug and the seating die features a built-in crimping ring and seating plug. This combination is sure to produce consistent, reliable ammunition time and time again. Shellholder sold separately. Note: Redding dedicated die sets are designed for one specific caliber. However, realizing that many reloaders what to reload similar calibers (Such as 38 Special/357 Magnum) with the same die set, these Combination die sets were created. The sizing and expanding dies will work the same for either caliber but the seating die will have to be backed out to relocate the crimp when loading the longer cartridge.