Build a deck the easy way using Pylex adjustable deck support brackets. You can install these brackets in a deck-block or a concrete sonotube. They allow you to level the deck floor during construction to help create an even base. You can also adjust the structure up to 3" in case the ground shifts after freezing and thawing. These deck support brackets fit 3-1/2" square posts and can support decks weighing up to 2725 lbs. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.