The Hornady Lock-N-Load Die Bushing is a great way to get the most out of your Lock-N-Load press. The unique Die Bushing allows dies to be changed with a flick of the wrist. Simply insert the die into a Lock-N-Load bushing, place the bushing in the press, and lock it into place with a twist of the wrist. The six lugs on the bushing will hold the die securely in place. Change dies in seconds! Will only work with Hornady Lock-N-Load Presses or reloading presses with the Lock-N-Load Conversion Bushing Kit installed.Notes: As long as dies were locked in place before being removed from the press, dies will not have to be readjusted when reinstalling in the press.