This adapter can be used for a 14 x 1 LH suppressor, muzzle brake or other accessory that needs to be adapted for a standard AR-15 or firearm with 1/2x28 Threads. Adapt your 14 x1 LH compensator or suppressor to use on your AR15 .223/5.56 or 9mm pistol barrel. Adapter is female 1/2x28 to 14 x 1 LH (male)