The Sure-Lock Lock Ring lets you make precise adjustments of all standard 7/8"-14 dies and accessories. Most other die rings lock by jamming a set screw directly into the threads, but the the split-ring design of the Sure-Loc ensures the tightening screw applies constant pressure to hold the ring in place, without touching or damaging the threads. It is also equipped with wrench flats to aid in the removal and replacement of dies without pliers ruining the lock ring. Weight: 0.06 lb. Comes in a pack with one ring.