DeckoRail Tiffany-style post caps bring matchless stained-glass beauty to your deck, transforming it from a project to a work of art. Handcrafted with exacting standards, this charming post cap features a stained-glass grapevine design. Functional, too – it protects the deck post from weather. The post cap’s western red cedar base naturally resists insects. Can be installed on any standard 4 x 4 wood post, including mailboxes, porches and fences.