This kit will help you install the correct front sight post for your rifle to insure proper sight elevation with your rear sight. It comes with a standard A2 front sight, a .040” taller front sight and a .060” taller front sight, plus an installation tool. The .040” post is recommended for most rifles that have a standard A2 height front sight base (non F marked) and a rear flip sight or mil-spec carry handle. For rifles with the longer rifle length sight radius, such as the Windham Weaponry Dissipator or rifles with a 20” barrel or longer, a .060” taller sight post is recommended. All pieces are made from black finished steel and are made in the U. S. A.