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.