Hi! Although we cannot speak for this photo, there are many different ways to hang patio lights. Screw-in hooks work well for hanging patio lights across wood beams. We have also seen eye bolts and quick links used for wooden surfaces. If you are trying to decide on the best pattern to hang in your space this guide is very helpful! http://www.yardenvy.com/diy/how-to-hang-patio-lights
Christmas Lights, Etc