Qualarc FIN-S4-BK Decorative Rust Free Cast Aluminum Deck Post Cap Large Ball, 4" x 4", Black Rust Free Cast Aluminum with a powder coated scratch resistant finish Protects the top of existing or new posts, adding many years of life to your fence and value to your home Outlasts any wood product on the market Fits a standard 4 "x 4" post. (3.5" x 3.5" up to 4" x 4"). Easy to attach with 2 screws included Size: H 6" x W 5.5" x D 5.5" Weighs 1.5 lbs