The Apex grade thread protector is expertly crafted to safeguard threaded pistol barrels, ensuring long-term durability and reliable performance. Designed for a precise fit, it prevents wear and damage while maintaining a clean, professional appearance. Each protector includes a pre-installed O-ring, providing a secure hold and added stability during use. This essential accessory is included with Apex's selection of threaded barrels, delivering the quality and protection shooters expect from a trusted name in firearm components. Screws on to the end of your 9mm threaded barrel to protect the threads from damage, ensuring longevity Unique offset pentagon pattern provides a distinctive look Captured O-ring pre-installed and remains in place in the thread protector when removed, providing a secure and easy-to-use sealing solution for barrel threads 9mm options for pistol barrels featuring 1/2-28 threads (right handed), offering compatibility with popular suppressors and muzzle devices