The Alexander Arms Thread Protector is perfectly designed for installation on the .50 Beowulf weapon system. The thread protector features a 49/64"-20 RH thread for barrels threaded with the same pitch. Constructed of solid steel with a beautiful matte black finish as well. This thread protector is a great option for protecting your barrel threads and having a stylish design at the same time. Please note Alexander Arms tells us these brakes are only for use with 49/64"-20 threads of their specification. FeaturesSolid Steel ConstructionMatte Black FinishPrecision Machined