Frankford Arsenal Die Locker Rings, Fits 7/8"x14 Dies, Anodized Finish, Blue, Aluminum Construction, Pack of 3 Lock Rings, Includes Lock Ring Wrench 1202448
Finger tighten, set and forget, they never move. Just be sure to always loosen your dies by turning the ring, not the die. The rubber insert acts a friction washer to keep the lock ring in position...