Prewired 15A quad receptacle can be wired as standard quad receptacle or isolated ground. Flange available painted in gray (GY), black (BK), ivory (VY), and brushed metal finishes in aluminum (AL) and brass (BS). Aluminum and brass flanges shipped with black cover. Brass flange also available with brass colored cover assembly (AB). Aluminum flange also available with aluminum colored cover assembly (AA). RC9 Series Poke-Thru Devices require a 3 1/16'' (78mm) diameter hole. Not designed to work with bare concrete or terrazzo. Floor covering thickness 1/8'' minimum.