Abw44z, Adjustable Post Base, Features 1″ Stand Off Height Above Concrete Floors, Reduces The Potential For Decay At Post & Column Ends, Increased Capacity To Resist Uplift Loads, Nominal Post Size: 4″ x 4″, Made From 16 Gauge Steel, Zmax Galvanization Offers Extra Corrosion Resistance, Install With 1/2″ Anchor Bolt & Eight 10D Common Nails Or #9 x 1-1/2″ Strong Drive SD Screws.