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 manufacturers