RCBS Full-Length Sizing Die is engineered to the highest standards and manufactured to the tightest tolerances. Constructed of case-hardened steel, precision-drilled, reamed, polished and hand-inspected twice before leaving the factory. RCBS die 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 die for bottleneck case has vent 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. Size: .223 Rem. (5.56mm).