circa 1920s or 30s Beautiful Cast Brass decorative bobeche, 4 inch diameter , and the inner opening is 1 3/8 inch . These have screw threads in the inner opening for attaching these to the threaded uno socket shells , on the Lighting fixture . A beauty ring for sockets , or socket cover . These pieces were used to Beautify the common down lightt fixtures so popular during this time . These Bobeche are a back ground of antique gold , with lovely touches of green paint used to pick out details . in the fine craftsmanship of this Old Lamp Accessory. Listing is for 1 set of 3 bobeche.