Easy to install, screws onto the lamp harp after installing the lamp shade. Antique brass decorative metal lamp part shade finial of a BEAR that measures 1 7/8" wide x 1 3/4" tall. It has standard threaded finial hole (1/4-27) that works with standard harp (lamp bracket). If you need to fit a standard 1/8 IPS lamp (3/8" diameter) pipe buy a reducer from Like Amazon item #B07XPDF481.