Pier mount adapter is made of rust-proof aluminum,high-quality powder coating has corrosion resistance, yellowing resistance and weather resistance. | Post light adapter suitable for any standard 3" post light fixtures. | Just apply the attached kit to fix the pier mount base on concrete or wood. | Post light base not applicable to any light pole. Please confirm whether the mounting method and size of the base meet your requirements before purchasing. | Windben provides professional customer support, please contact us through Amazon if you have any questions.