This muzzle thread protector features 1/2-20 threading with a 0.625" length designed to fit select .22 caliber firearms.Muzzle Thread Protector - SKU: GTHM2421/2-20 thread pitch for secure attachment0.625 inch overall lengthCompatible with some .22 caliber rifles and pistolsProtects barrel threads when muzzle device is not installedEssential for maintaining thread integrity and preventing damage to your firearm's muzzle threads during storage transport or when not using a suppressor or other muzzle device.