6" x 6", 18 gauge, steel post & column base, secure the bottom of posts or columns to concrete & are perfect for decks or patio covers, positive connection for a post to a wood deck, stronger than angled nailing or screw fastening, 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.