Tidy Seed bird feeders fit any cage. Designed with perching perfect for small parrot feet. Attaches inside or outside. Virtually eliminates food and seed scattering and food waste. Transparent strong plastic. Safe, durable, and comfortable for your birds. Easy installation hooks offer secure one step application by screwing into predrilled holes. No tools required. Great for small parrots, and birds from finches, cockatiels, parakeets parrotlets, and conures. 5.4 x 5.2 x 4.3 inches