The Lee .45/70 Government Collet Neck Sizing Die is a precision tool designed to resize only the case neck, ensuring accurate alignment and reducing run-out. Using a collet mechanism, this die squeezes the case neck against a precision mandrel, creating a perfectly aligned neck without overworking the brass. Unlike other dies, it requires no case lubrication, simplifying the reloading process. The die features integrated Breech Lock quick-change threading on the exterior of the die body, making it compatible with any Lee Breech Lock-enabled reloading press for fast and convenient die changes. This die is ideal for reloaders who are using brass that has been fired through their own firearm, ensuring optimal performance and consistency with every reload.