The Lee Deluxe Automatic Processing Press gives you the same priming convenience found only on expensive progressive reloading presses. Lee started with the basic APP, added the Roller Handle, Universal Case Feed Magazine and the APP Deprime kit. Then they fitted the tool with the Patented automatic primer feed system. There is no priming system made that is as fast, effortless, or uniform as the APP primer. Cases and primers are automatically fed. Primers are seated uniformly without "feel" or adjustments required. Safe with any brand or size of primer. Change primer size in seconds. Simply twist out the priming chamber and swap out the pin and primer guide. No shell holder Mfg: Lee Precision