Armanov Quick Disconnect replaces original Dillon Powder Measure half ring retention. Installation is super simple. Just remove original half-ring retention and install Armanov Quick Disconnect for Dillon. It has two internal springs and allows quick change of powder bar from one tool-head to another. Armanov Quick Disconnect fits on the RL-550, XL-650, and Super-1050 powder measures. It is specially useful In combination with Clickable Armanov powder knob. You can reuse powder measure on other tool-heads and adjust powder quantity with simple clicks. Quick and tool-less removal and installation of Dillon Powder Measures.