Dies are the heart of the reloading process. Engineered to the highest standards and manufactured to the tightest tolerances, theyre constructed from case-hardened steel, precision-drilled, reamed, polished and hand-inspected twice before leaving the factory. RCBS dies can be counted on to produce consistent and reliable results for shooters who demand reloads equal to the quality of their firearm. Includes plastic storage box and loading data table. Full-length sizer dies for bottleneck cases have vents to prevent case damage from trapped air and excessive lubricants. Seater dies have a built-in roll or taper crimper. Large, easy-to-adjust hex-lock rings. For sizing cases to minimum-specified dimensions in the body and shoulder for improved feeding and proper function in semiautomatics, pump-actions and some lever-action rifles. Includes small-base sizer die with expander/decapping unit and seater die with bullet-seater plug. Not recommended for ammo to be used in bolt-action rifles. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Rifle Dies.