The Hornady neck turning tool mandrel is an essential accessory designed for use with the Hornady case neck turning tool. This precision-engineered mandrel is available in a variety of sizes to accommodate different calibers, allowing you to accurately and efficiently trim the outside of your case necks to achieve consistent uniformity. The caliber-specific mandrel ensures perfect alignment during the neck turning process, making it an indispensable tool for reloaders seeking precision and consistency in their ammunition.