The RCBS Shellholder #37 is precision-engineered from hardened steel to provide reliable case alignment with reloading dies in single-stage and turret presses.RCBS Shellholder #37Hardened steel construction for durabilityDesigned for proper case-to-die alignmentSized for specific case headsCaptures 0.125 inch of case head for proper SAAMI headspacingCompatible with single-stage and turret pressesEssential for accurate and consistent ammunition reloading ensuring proper headspace and reliable performance in your reloading setup.