These circa 1920s or 30s Lighting restoration supply parts , are cast white metal , Bobeche, for vintage ceiling lights or some chandeliers with threaded uno socket down lights . These vintage metal lamp parts , were screwed onto the socket right above the bulb opening and these worked as a beauty ring and gave the junction of bulb and fixture a more finished look . This particular set as is would work well in a cottagecore , or shabby style decorating scheme as the original finish is rather worn . These are salvaged pieces . These can easily be cleaned and re painted for a lamp restoration project . The parts are sound just the early paint finish is worn . see photos . These metal ring shaped lamp parts measure 3 3/4 inch diameter , and 1 3/8 inch center hole .