The Backup Tactical Frag Thread Protector features 1/2X28 threading designed specifically for .223 Remington barrels with a durable black finish.Backup Tactical Frag Thread Protector1/2X28 thread specification for .223 RemingtonPrecise manufacturing for reliable fitDurable black constructionLong-term reliability you can count onEssential for protecting barrel threads when muzzle devices are removed this thread protector ensures your firearm maintains optimal performance and thread integrity during storage and transport.