6x6 Post Cap - (Nominal) Mocha Brown Flat Top - 10 Year Warranty! Fits a Standard (Nominal) post. (5.5" x 5.5" up to 5.75" X 5.75") These caps slide down the post 1.5" and are 7.5" at their widest point. 10 year guarantee against fading, discoloration and warping! High impact, remarkably sturdy ASA resin. The same material used to in automobiles! Quick and easy patented SNAP-CAP installation, built right into the cap!