Take this pulley apart by removing the screw, so you can thread the cord through. These pulleys add a nice industrial look to your lamps. Use the plastic clamps, included with all lamps and kits, as stops for the pulleys. Position clamps on the back side of the pulley. Insert threaded pulley into wall or ceiling. This iron pulley measures 1¼" diameter and 3¾" tall. Set of 2.