This hanging hook works perfectly with the hummingbird feeder.  It easily attaches to windows so you can see them up close.  But I imagine it can be used to hold all types of items.  Can hold approximately 3 lbs.  Made of a strong UV polycarbonate which is good because who wants a yellowed hanger hook.  I liked that it won’t crack or peel and you can mount it either way.  This is a game changer.  Hummingbirds, dinner is served!