The Redding bushing style neck sizing die provides reloaders with a simple means to precisely control case neck size and tension. Uses interchangable sizing bushings available in 0.001" increments The adjustable decapping rod allows positioning the bushing to rezie only a portion of the neck length if desired and Concentricity is enhanced by the ability of the resizing bushing to self-center on the case neck. The decapping rod is supplied with a standard size button. The is especially useful for reloaders who are using commercial bras as-is. A decapping pin reainer is also supplied with most Type S bushing dies except 17 and 20 caliber. This enables neck sizing without the use of the size button for those who sort and/or turn case necks for uniformity. Bushings not included. The easiest way to determine the proper diameter bushing is to measure the neck diameter of several loaded or dummy cartridges with an accurate micrometer. (These dummy cartridges can be loaded with your old set of dies or a borrowed set.) Then and simply subtract 0.001" from the cartridge that had the smallest average measurement. This will allow for a slight amount of spring back and create a proper press fit for the bullet.