Royal Designs Candelabra Base Sockets have an adjustable bracket that provides a more flexible installation. Loosen the screws and you can adjust the socket from 3.15" to 4.65"H overall. The bracket has a 1/8 IP threaded hole on the bottom so it will fit any standard lamp pipe or nipple. The socket is rated for up to a 75W bulb. Brass and silver wire screws make it easy to properly add a cord to the socket (Brass color screw goes to the smooth side of the cord). Additional Details ------------------------------ Product description: Royal Designs Candelabra Base Sockets have an adjustable bracket that provides a more flexible installation. Loosen the screws and you can adjust the socket from 3.15" to 4.65"H overall. The bracket has a 1/8 IP threaded hole on the bottom so it will fit any standard lamp pipe or nipple. The socket is rated for up to a 75W bulb. Brass and silver wire screws make it easy to properly add a cord to the socket (Brass color screw goes to the smooth side of the cord).