GrovTec's Thread Protectors offer an ideal solution for safeguarding threaded barrels. With availability in a range of popular thread pitches and external diameters these protectors are designed to ensure long-lasting protection and maintain the pristine condition of your barrel threads. Featuring a sleek black oxide finish they accommodate a "1/2X24" thread pitch and a .641 diameter making them suitable for aftermarket 9MM barrels. Proudly crafted in the USA this product guarantees reliability and quality.