Classy Caps SL082B Aluminum Imperial Solar Post Cap, 2.5" x 2.5", Black High performance solar lights stays lit for up to 10 hours Lights up automatically every night 2 high output led's for brilliant white light 1 long life AA rechargeable battery included Will fit over three post sizes - 2.5"X2.5", 2.25"X2.25" or 2"x2" post (2 adaptors included)