The YHM .920 Bull Barrel Thread Protector features 5/8-24 threading with a durable black plated steel construction designed to safeguard your rifle barrel's muzzle threads.YHM .920 Bull Barrel Thread Protector5/8-24 thread pitch compatibilityBlack plated steel constructionProtects muzzle threads from damageEssential when muzzle device is not installedThis thread protector is essential for maintaining your rifle barrel's threading integrity during storage transport or when a muzzle device is temporarily removed.