Redding neck sizing dies are designed to size only the necks of bottleneck cases, thereby extending the lifespan of the brass and enhancing accuracy. It is crucial that fired cases are not interchanged between rifles, as the neck sizing dies do not resize the shoulder or body. These dies are ideal for cartridges used in bolt-action rifles. Each die is manufactured from the highest quality alloy steels available and machined on hardinge super-precision lathes, which are capable of maintaining the industry's tightest tolerances. The dies undergo heat treatment in atmospherically controlled furnaces and are hand-polished to ensure smooth and flawless operation. They are built to maintain tolerances and provide a lifetime of use. Each die is inspected and ultrasonically cleaned prior to packaging.