This is a Bakelite look-alike socket, black, with a push through switch and UNO threads. It comes with one retaining ring. The ring has a 2.1" outside diameter. The widest diameter of the socket without the ring is 1.54". The socket is 2.75" high, medium base, fits 1/8-27 IPS. It is UL listed, 250V, 660W.

This product is the socket with one retaining ring only, as shown in the center picture. Wire, bulb, strain relief, and second ring (shown in left hand picture) are not included. The other lamp parts shown in the pictures are available below in the related products listings.