For this rain chain, we used 2 1/2-inch #6 bolts and nuts and chain small enough to fit through the funnel hole but big enough for the bolt to go through its links. One bolt and 3 nuts create the crossbar. Thread the bolt through the hole in the right edge of the funnel, then screw on a nut. Thread the bolt through a link in the chain and add another nut. Finally, thread the bolt through the left hole in the funnel rim and tighten a nut on the end. Use the 2 center bolts to hold the chain in the center of the crossbar.