BA-311SG. A-Frame Sidewalk Board. A-Frame Sidewalk Board Features a Green Porcelain Chalkboard and a Black Aluminum Frame. Size 42"Hx18"W A-Frame Sidewalk Boards make great Menu Boards or POP signs that broadcast messages effectively. Great for restaurants, pubs, markets and retail stores. Frame is Black Powder Coated aluminum surrounding a Green Porcelain Chalkboard. Size 42"Hx18"W. Steel Reinforced Corners Weather Resistant Hardware Unique Plastic Camel Foot Floor Leveling System Full Width Aluminum Hinges .