EASY TO INSTALL. These are very strong and won't fall off from winds or rain. Size: 7.5" (in) 18.8. cm height. 4.0" (in) 10.0. 7.5" (in) 19.9 cm length. WHY YOU SHOULD BUY OUR BIRD FEEDER?. Bird feeders are great for entertaining children and adults too, educating about the different bird species, and stress relief.