Adjustable Harp-- It can meet the requirements of different heights, and can be adjusted according to the needs. If you find that the connection is loose, you can force the two sides of the bracket to open outwards, so that it can be locked with the base. Easy to Install--Package include 2 set lamp shade harp holder, per set include 1pc adjustable frame, 1pc IPS standard saddle and 1pc UNO adapter. The detachable lamp harp group can easily fix the lampshade to a standard desk lamp or floor lamp, and the ball head is easy to screw and unscrew. Polished Metal--Top of harp accepts standard 1/4-27 threaded finials and cap knob finial is included in this set. The lamp harp holder is made of metal that can prevent lamp harp from getting rust. Standard Saddle Base Slips 1/8 IPS (3/8" diameter) lamp thread. UNO Slip-on attachment--Inner diameter 36mm, 1.42in, make sure your lamp socket base is E26 with threaded Collar Ring, Used for Spider lamp shade. Please Note-- Please make sure that your bulb holder is E26 with ring, dedicated to E26 lamp holder converter.