Deckorators post cap. Adds lighting to deck and fence posts without the hassles of wiring and electricity. Features 2 removable collar inserts nested inside the base to fit post sizes between 5" and 5-1/2" square. Remove 1, both, or none of the bases to achieve actual inside dimensions of 5-1/2" x 5-1/2", 5-1/4" x 5-1/2", and 5" x 5". Includes 2 rechargeable batteries.