Fine tune your reloading process with specialty dies engineered to precisely perform specific tasks. You’ll find that using these dies may speed up your production by consolidating steps or enhance the precision of your handloads. Detects a no powder or double-charge condition in the progressive reloading process and then locks up to alert you of a problem. It won’t let you continue until the improperly charged cartridge is removed. For use with straight-wall cartridge pistol calibers 9mm and larger and only on progressive reloading presses.