Made from stainless steel and finished in black oxide, this thread protector can be a replacement to an already purchased adapter. Also, if a gunsmith threads a barrel with SilencerCo's unique O-ring engagement feature, this thread protector is perfect.When transporting your firearm or waiting on ATF approval, you can keep your threads crisp and protected with a thread protector. Careful not to cross-thread, simply twist the thread protector on the end of your barrel to prevent dust and debris from clogging your threads when no silencer is in use.