This small Exterior feeder fits Featherland 18x27 and 21x30 cages, as well as Bella BirdCo 22x16 cages. After removing the standard feeder, simply slide this stainless steel body into the 4 holes on the cage body. Place durable molded see-through cover on, insert ceramic crock, and you are ready! Birds now have a very difficult time throwing their food, and food they pick at falls back into the dish, not onto your floor. It's fun to be able to watch your bird, you save money because less food is wasted, and you save time because there is less mess on your floor - a win-win-win. And with these feeders, a skirt in not necessary, saving you space as well. Buy one, or two, or three now!