Dies are the heart of the reloading process. Engineered to the highest standards and manufactured to the tightest tolerances, they’re 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. RCBS X-Sizer Dies reduce the total number of reloading operations by limiting the growth of the overall case length of each cartridge, which eliminates the need to trim each case. They work in progressive and single-stage reloaders. Available in many popular calibers. Eliminates the need fro repeated trimming after an initial trim of .020" off the maximum case length to standardize the case.