"The RCBS Rifle Die Set features an expander-decapping unit to remove spent primer as it expands the case mouth. Built-in vent holes prevent case damage. Seater die includes a bullet seater plug and built-in roll or taper crimp for specific cartridges. Made of case-hardened steel, every die is properly hardened and hand polished for superior durability. Large, easy-to-adjust hex lock rings utilize hex head setscrews (standard 7/8""-14 thread, unless otherwise noted). These full-length sizer dies also feature vents to prevent case damage caused by trapped air or excessive lubricant. Headspace is held to minimum tolerances to avoid changing the case body length during sizing. Shell holder not included. Delivers top quality reloads Precision drilled and reamed to exacting RCBS standards Hardened and hand polished Standard 7/8-14 thread Case-hardened steel construction Built-in vents prevent damage from trapped air or excessive lubricant RCBS Precisioneered Reloading Dies are for shooters who want reloads that deliver the same quality performance of their guns. Precision-drilled and reamed to the same exacting standards as the finest gun mechanisms, these dies feature the rigid specifications RCBS has developed over its 60+ years of die manufacturing. Find out why RCBS produces more reloading dies in more calibers (more than 3,300) than any other reloading die manufacturer."