Featuring the same adjustable width mesh of the choice ground guard this fantastic new sanctuary will protect any of your existing tube feeders that are up to 17 tall including any solid hanger whilst allowing you to choose which birds can use the feeder the gaps can be set to anywhere between about 24mm and 48mm and can easily be adjusted at any time so at its minimum it will only let in the small birds whilst at its maximum it will exclude large birds but still allow starlings in to fee