Redding Die Spacers allow for quick compensation for case length, partial resizing, or to make a no-crimp adjustment without the need to move the locking rings. Fits all 7/8" - 14 Dies. Notes: Spacer fits between die and press. Spacer is used to change the amount of resizing or crimp you add to your rounds. Spacer works with all standard 7/8" x 14" dies.