This is the perfect accessory for reloaders still using older Lyman presses with the J-Type shellholder. This convenient adaptor converts older J-Type shellholder presses to the current X-Type shellholder press.Notes: For use with Lyman's older presses which used the older J-Type shellholders Converts press to use current X-Type Shellholders You also need Lyman's Special T Priming Punch - product number 779142