4-1/2" x 4-1/2" Solid Copper Post Cap for decks, fences, patios and gardens helps to keep your posts from rotting and enhance the look of your outdoor living space. These caps install easily with a little bead of outdoor adhesive applied to the inside lip. Made for a 4-1/2" x 4-1/2" post these caps have an actual inside measurement of 4-5/8" x 4-5/8". Will naturally patina over time if left alone or they can be polished periodically to maintain their shine.