Featuring precision-machined US steel construction with a black nitride QPQ finish, the Kaw Valley Precision 11/16x24 Thread Protector is a must-have for your PDW or tactical rife. Manufactured on an 8-axis Swiss lathe, this thread protector features precise 11/16x24 threading and protects against stripping and other damages, while the ID bored design protects the crown of the barrel to maintain accuracy. Plus, factory-machined wrench flats facilitate lightning-fast installation and removal. Made in USA.