Woodway Glass Post Cap 4 x 4 &ndash; Outdoor Pyramid Post Cap for Garden, Deck and Patio, Amber, 9 Pack This glass post cap is made to withstand outdoor conditions and resists cracking. Sold in a pack of 9 caps. This glass post cap provides top protection to your posts by keeping moisture from settling into the wood. Glass fence post caps add visual appeal to any home whether it's a fence, deck, garden, or walkway. This pyramid post cap has a traditional design that can coordinate with any decor and adds a splash of color. Glass post cap measures 4 x 4 and slides onto any post and is secured with adhesive. Fits any 3.5 inch post.