"Patent # 8,418,651" The Double "D" Squirrel Feeder is constructed of the same 16 gauge galvanized steel as the Double "D" gravity deer feeders. It will attach to any tree or post to give the little critters of the forest or back yard easy access to the feed. The load capacity of the Double "D" Squirrel Feeder is approximately 25 pounds. The box is one foot wide with a 6 inch trough. The rap around bottom gives the squirrels' easy access to the feed.