Product reviews for Spline Drive Breech Lock Bushing 4 pack

Do not hesitate to by these. The locking screw is the way to go. They lock solid with just a light twist of the Allen head bolt and you can make small die adjustments very easily. The need for a lock ring is completely gone.
I cannot recommend them enough. I would like to see more colors offered for trim dies, collet sizing dies, bullet sizing, etc.