Premium Neck Expander Die Features The Redding Neck Expander Die offers a competitive price exceptional steel quality and a company lifetime guarantee. Designed for reloading handgun cartridges these dies gently bell the mouth of the cartridge prolonging the life of the brass while enhancing accuracy and performance. Only the neck is sized opposed to the body and shoulder. Because of this at no time should you interchange fired cases between handguns of the same caliber. Premium Neck Expander Die Specifications Redding Premium Neck Expander Die For Handgun Cartridges .45 ACP