Solar Light Fence Post Caps Matte Black, Fits PVC 4x4 Posts Only (Colonial Style)&ndash; (Set of 12) Sun Powered. No Wiring. On/Off switch. Ultra Bright LED. Powered by the sun. Fast & easy install Rechargeable Ni-Cd AA battery included. Energy, electrical saving Ideal for areas where conventional electrical supply is not available One High output long lasting ultra-bright LED bulb. Product size 5.5"x5.5"x4.5", opening of bottom is 4 1/16x4 1/16