AA-3B. A-Frame Sidewalk Board. A-Frame Sidewalk Board Features a Black Composition Chalkboard and Clear Satin Anodized 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 clear satin anodized aluminum surrounding a Black Composition Chalkboard. Size 42"Hx18"W. Steel Reinforced Corners Weather Resistant Hardware Full Width Aluminum Hinges Unique Plastic Camel Foot Floor Leveling System Full Width Aluminum Hinges .