Take these pulleys apart by removing the screw, so you can thread the cord through. These pulleys add a nice industrial look to your lamps. Insert threaded pulley into wall or ceiling. As stops for the pulleys, use the plastic clamps that are packaged with all of Colonial Tin Work's lamps and kits. (Not included in this package of 2 pulleys). This iron pulley measures 1 1/4" diameter and 3 3/4" tall. Set of 2.