Protects post from nature's elements. Southern pine. 4 in x 4 in post cap has 3-5/8 in x 3-5/8 in opening size, for posts measuring 3-1/2 in x 3-1/2 in. 6 in x 6 in post cap has 5-5/8 in x 5-5/8 in opening size, for posts measuring 5-1/2 in x 5-1/2 in. Copper Top.
