This heavy duty press has several innovative features that make it one of the best reloading presses for threaded dies on the market. The design includes: 1) Snap-in, snap-out die change making die changing a two second operation, 2) Automatic self-acting shellholder which supports the case by spring loaded jaws, 3) Positive spent primer catcher collects spent primers and carbon in a container. This press can be used with all standard 7/8"-14 dies (many of them with existing lock rings). Works with all Redding Competition Dies. Great new cover for the Co-Ax Press made from breathable heavy nylon to prevent moisture buildup.