Compatible with the Lock-N-Load® AP and single-stage Classic press, the Hornady Die Wrench Deluxe is a 4-in-1 reloading tool designed to hold the shell plate in place while changing plates, tighten the main press screw, adjust the tightness of the spindle lock and the lock rings and tighten or loosen the die flats. Hornady Die Wrench Deluxe - Reloading at Academy Sports