Sure-Lock Lock Rings Lets you make precise adjustments of all standard 7/8"-14 dies and accessories. LOCK RING: Clamps around the whole die. Canâ€™t damage the threads. Applies constant pressure across the threads to hold the ring in place. Most other die rings lock by jamming a set screw directly into the threads. WRENCH FLATS: Remove and replace dies without pliers ruining the lock ring.