The Hornady Sure-Loc Die Locking Ring is a terrific addition to any 7/8"-14 threaded die. The split ring design ensures the tightened screw never touches the threads and cannot damage the die. The Locking Ring applies constant pressure across the threads to hold the ring in place, so your die settings remain the same when switching between calibers. The Sure-Loc ring features wrench flats that allow easy removal of the lock ring without damage.