RCBS Full Length .300 AAC Blackout Die Set Made of the highest quality materials Hunting reloading dies Another quality Bushnell product Made from case hardened steel Precision-drilled and reamed to the same exacting standards as the finest gun mechanisms Full-Length Sizer Dies for bottleneck cases have vents to prevent case damage Properly hardened and hand polished Large, easy-to-adjust hex lock rings utilize hex head setscrews