Hinge #5, standard 11 gauge, plain steel. Used on very tall doors with six sections or more, usually between sections 5 and 6. The #5 has the largest offset of the standard numbered hinges so the roller sits in the right position as the door moves through the track. Most residential doors do not use a #5, so if you need one, it is usually for a taller custom door. Check the number stamped on your old hinge before ordering to make sure it is a #5. The 11 gauge steel is thicker and stronger than lighter standard residential hinges, so it holds up well on heavier doors and doors with frequent use.