Secures lampshade to standard table or floor lamps Easy to install, screws onto the lamp harp after the lamp shade Lamp finials are threaded to fit standard lamp harps This will only work with a lamp shade harp (bracket)- if you need this to work with lamp pipe (standard 3/8" outside diameter) then you will need to buy a reducer Like Amazon item B07XPDF481 Antique brass decorative metal lamp shade finial of a DRAGON that measures 2 1/2" wide x 2 5/8" tall. It has standard threaded finial hole (1/4-27) that works with standard harp (lamp bracket). Please note- this will only work with a lamp shade harp (bracket)- if you need this to work with lamp pipe (standard 3/8" outside diameter) then you will need to buy a reducer. Like Amazon item #B07D7H2P76. Decorative Lamp shade finial.