This cross bolt die lock ring clamps around the entire die, resulting in a more precise mating of the lock ring threads to the die threads.It is supplied with all forster's high quality bench rest dies.It's easy-to-use cross bolt connects the two ends of the ring instead of a traditional screw design that tightens directly into the threads of the die, resulting in a more precise mating of the lock ring threads to the die threads.It also provides a more reliable alignment with no canting, and no damage to the die threads, which remain undamaged.To tightening or loosening the steel cross bolt screw requires only a 7/64 hex key (allen wrench).Fits standard 7/8-14 thread dies from most manufacturersCaliber: Multi-CaliberIn Set: 12 pack