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 Cap/Base 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 1-1/2" Strong Drive SD Screws.