These panels are taller and wider than corresponding NEMA-size panels. Metal panels are 14 or 12 gauge steel and painted white or have a conductive finish. They include a formed flange along any side that is longer than 22.20 in. (564 mm). Optional wood panels are made of 3/4-in. plywood, pre-cut and pre-drilled to install on panel mounting studs in the rear of the cabinet.