Just like the standard setting Auto Prime, you never touch the primers from box to priming. Uses the same inexpensive shell holders as the Auto-Prime. No need to endlessly swap your press shell holder to your priming tool as other brands do. Symmetrical design allows effortless right or left hand operation. Comfortable lever with just the right amount of mechanical advantage effortlessly seats even the most difficult primers with just finger pressure. The perfect mechanical advantage to feel the primer seating completely home into the primer pocket. Includes priming assemblies for large and small primers. Made of a water clear tough polyester material that allows you to monitor the primers passage from the tray to the primer pocket. Change primer size or shell holder in seconds. Includes the folding primer traygo from box to priming in seconds. Tray has a built-in primer flipping feature allowing direct filling from today's large primer boxes.