The Secure-Mount Post and Deck Mounting Kit for TimberTech and Azek Railing provide a solution for installing railing posts directly onto a deck or porch surface, without the use of a 4x4 treated post. Designed to work with: TimberTech Evolutions Contemporary and Builder Rail, RadianceRail, and Azek Premier, Trademark, and Reserve rail. The Secure-Mount Post is designed for use on decks and concrete surfaces. The Secure-Mount Post is adjustable to fit either 36" or 42" deck rails. The 6" Adapter is available for larger posts, and the Deck Mounting Kit includes the necessary hardware. Mounting kit also sold separately. For a 6x6 post sleeve, order the Secure Mount Post, the 6" adapter, and the Deck Mounting Kit if necessary.