4x4 Post Cap (Nominal 3.5") - White Flat Top - 10 Year Warranty Fits a standard (Nominal) post. (3.5 x 3.5 up to 3.85' x 3.85'). 10 year guarantee against fading, discoloration and warping! High impact, remarkably sturdy ASA resin. The same material used to in automobiles! Made in the U.S.A. Quick and easy patented SNAP-CAP installation, built right into the cap!