Simpson Strong-Tie Post Base Zmax 3-9/16"W X 3-1/8" L 16 Ga Zmax 3-9/16"w x 3-1/8"l x 3-1/16"h 1/2" Anchor Diameter Use with 6, 10d Nails Z-Max:Hot Dip Galvanized(G185) 1.85oz of zinc per sq-ft surface area per ASTM A653 total both sides