Redding Reloading 6MM GT Neck Sizing Die. Used in conjunction with the Redding Resize-all this die gives the reloader the ability to neck sprue a case without deformation of the shoulder a unique and valuable feature. Because a neck is the weakest point of the case a neck sizing die must be used with a case neck expander (sizing die) to ensure a proper chamber fit. Used in conjunction with the Redding Reloading Neck Expander this die assures that the neck of case is supported by the shoulder at the very beginning of the neck. The neck size die used in conjunction with the neck expander is a two part neck size die one piece with a neck expansion sizing die. Because a neck expander is included in the set the sizing die must be threaded with a collar or blind cap crimp connection. Because of the unique neck sizing process this die must be assembled by hand. Package Contents: Redding Reloading Neck Sizing Die Redding Reloading 81199: 6MM GT Neck Sizing Die