A Redding Type S Bushing Style Neck Sizing Die is a reloading die designed to precisely control the size of a cartridge case neck by utilizing interchangeable bushings, allowing reloaders to adjust the neck tension on their brass with great accuracy, particularly beneficial for competitive shooters seeking optimal consistency; it features an adjustable decapping rod to position the bushing for precise neck resizing and can be used with different sized bushings depending on the desired neck tension.