6 x 6, 18 Gauge, Galvanized Half Post Column Bases, Secure The Bottom Of Posts Or Columns To Concrete Are Perfect For Decks Or Patio Covers, Dual Purpose Post CapBase For Light Cap Or Base Applications, Provides A Positive Connection For A Post To A Wood Deck, Reduces The Chance Of The Post Splitting Eliminates Nailing Into End Grain, ZMAX Galvanization Offers Extra Corrosion Resistance For Exterior Treated Wood Applications, Install With 16D Common Nails Or 10 x 112 Strong Drive SD Screws