Reusable Revolution 12 Pack Solar Powered Black Outdoor Garden Post Cap Light for 4x4 PVC Posts Black Matte Finish Brilliant White LED, with over 100,000 burn hours Rechargeable Battery included (AA Ni-Cd) 100% Solar Powered no external wiring necessary This light will fit vinyl posts - not wood - that are 4" x 4" in dimension. Product Dimensions: 5.75" x 5.75" x 6.5", Base Dimensions: 4" x 4