RCBS is an industry leader in reloading tools and equipment that focuses on quality and durability. In order to avoid headspace and sizing problems, it is important to use a shell holder that securely grips the shell and firmly fits into the press during the reloading process. RCBS Single Stage Shell Holders are designed to properly align the case with the reloading die in single-stage and turret presses and are manufactured from hardened steel for durability. Each shell holder is sized to fit specific heads and capture 0.125 inches of the case head for proper SAAMI headspacing.