6 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