The Hornady #37 shell holder for trimmer (5.7x28mm FN) is manufactured by Midsouth using premium heat-treated steel, ensuring both durability and superior performance. Designed with a wide mouth and rounded opening, the #37 shell holder facilitates easy insertion and extraction of cartridge cases. Steel subjected to controlled heating and cooling processes to enhance mechanical properties such as strength, hardness and durability Expansive, Curvilinear aperture Compatible with precision trimming of 5.7x28mm FN cartridges, ensuring optimal performance and accuracy