4 Pack Solar White Color Square Post Fence Mount 4x4 (WILL Only FIT 4" x 4" PVC POSTS not wood POST) Sun Powered. No Wiring Automatic dusk-to-dawn operation, On/off manual over-ride switch Recharged by solar panel under sunlight Upper Base Dimensions : 4" (l) x 4" (w), Lower Base Dimensions : 4" (l) x 5.5" (w) WILL Only FIT 4" x 4" PVC POSTS not wood POST.