Made from 5/8" poly-lumber (recycled plastic jugs and bottles) and stainless steel screws. Perforated metal trays lift out easily. The 1-1/2" diameter hole in the center cross brace allows mounting on a pole beneath another feeder (pole and mounting flange not included). A cap (shown) is included for covering the hole if the feeder is used on the ground or if a pole doesn't extend above the platform. Dimensions: 15.5" D x 19.75" W x 2-5/8" H. From Birds Choice.