This portable tool primes new or cleaned cases 's no need to use your press. Very useful for priming large quantities of cases before processing through a loader. The pliers-style design gives you more leverage, less fatigue and a better feel than thumb-operated styles. Holds both small and large primers right side up for proper feeding. Uses standard Hornady shell holders, and a converter is available for RCBS shells. This portable tool primes new or cleaned cases 's no need to use your press Very useful for priming large quantities of cases before processing through a loader The pliers-style design gives you more leverage, less fatigue and a better feel than thumb-opera Holds both small and large primers right side up for proper feeding Uses standard Hornady shell holders, and a converter is available for RCBS shells