The Forster Co-Ax XL Cross Bolt Die Locking Ring clamps around the entire die, resulting in a more precise mating of the lock ring threads to the die threads. They are the same as the locking ring supplied with all Forster's high quality Bench Rest Dies. FeaturesEasy-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 threadsProvides a more reliable alignment with no canting, and no damage to the die threads, which remain undamagedTightening or loosening the steel cross bolt screw requires only a 7/64a ^2 hex key (Allen wrench)