GEYUEYA Home Solar Post Lights,Warm White Solar Post Cap Lights Fence Post Lights Pathway Lights for 3x3 4x4 inch Wooden Posts Deck Cap Garden Yard Decoration-6 PacksPost Cap lights Solar Powered This Solar Post Caps fits 2. 5X2. 5,3X3,4X4,5X5,6X6 inches post. for 3X3,4X4 inches postsyou just need to install the screws directly from the sideIf the post diameter size is smaller or larger than this sizesyou can use the included the screws fix the bracket on the post top,then buckle the lamp directly. (Note: 5X5 6X6 inches size requires solid posts) Excellent Solar Panel Absorbs Energy Continuously The fence post