5-Prong Base Robust and Stable Our bird house pole was designed to 5 Prongs base, Extended 5-prong base enable the pole stand firm in the soil. And four of the feet is made of solid iron bars instead of hollow iron tubes. It will be stronger and more long lasting than other conventional bird house pole. No need to worry about strong winds and bad weather. Premium Quality & Easy to Install Rust resistant, heavy duty steel construction. With a 1 inch diameter steel pipe, much thicker than other bird house pole.