The Hornady Die Lock Ring Assembly 50 BMG is a great replacement item for your Hornady 50 BMG New Dimension die set. The lock ring allows you to make precise die adjustments, and will not harm the threads on your die. The lock ring clamps around the die to provide constant pressure across the threads to hold the die in place during use. The Die Lock Ring has Wrench Flats on the sides for easy installation and removal.