Easy to Install, Screws onto the lamp harp after installing the lamp shade Lamp finials are threaded 1/4-27 to fit standard lamp harps. Finial measures 1 1/8" wide x 2 7/8" tall. Lamp finials add a decorative flair to the top of a lamp, while holding a lampshade in place Antique brass decorative metal lamp part shade finial of a DRAGONFLY that measures 3" wide x 2" tall. It has standard threaded finial hole (1/4-27) that works with standard harp (lamp bracket). if you need this to work with lamp pipe (standard 3/8" outside diameter) then you will need to buy a reducer like B07XPDF481