The Lock-N-Load Reloading System is a unique bushing process that 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. The six lugs on the bushing will hold the die securely in place. Change dies in seconds! For use with Hornady Lock-N-Load Presses only. Steel.