Have you been looking for a high quality feeder that combines Feed, Grit and Oyster Shell compartments all in one? This feeder lets your birds choose what they need. It is made of heavy gauge aluminum with zinc plated screws, to last a lifetime. The over-all dimensions are 36"W x 17 1/2"H x 9 1/2"D with a 28" wide feed, 4" wide grit, and 4" wide oyster shell compartments. It mounts to the wall with mounting hole at both 16" and 24" spacing. Assembly is required.