These are bakelite type sockets for the Woodlites and E&J headlights. They plug in externally to the base of the light housing and can be bought in a one or a two element (button contact) configuration. The one element style is for a light with one wire/one bulb filament and the two element style is for the two wire/two bulb filament application. These are brand new reproductions which are identical to originals and are an excellent quality socket. Lenses, gaskets, and bulbs are also available for the E&J headlights. Resilvering for the reflectors is a service that is also available.