This product is a die only unit. These dies do not include a shellholder but are compatible with standard shellholders from manufacturers such as Redding, Hornady and RCBS. Additionally, they are compatible with our ZERO modular shellholder system. Following the significant success of our M-series sizing die, our objective was to incorporate as many of those industry-leading features as possible into a traditional 7/8 inches die. Precision-ground expander mandrels - each die set includes a 0.002 inches neck tension mandrel, for additional tension increments, utilize our comprehensive mandrel kit Full-length sizing from neck to extractor Mechanism for automated ejection of expended primers in spring-loaded systems Interchangeable high-durability steel decapitation pins for enhanced operational efficiency Precision reamer machined to exact specifications for accurate sizing (eliminates bolt adhesion issues post-second operation) Hydraulic shoulder pressure relief system Manufactured in the United States