Abw46z, 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", 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.