A-311SB. A-Frame Sidewalk Board. A-Frame Sidewalk Board Features a Black Porcelain Markerboard and Solid Red Oak Frame with a Clear Lacquer Finish. 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 solid oak with a clear lacquer finish surrounding a Black Porcelain Markerboard. Size 42"Hx18"W. Steel Reinforced Corners Weather Resistant Hardware Unique Plastic Camel Foot Floor Leveling System Full Width Aluminum Hinges .