Chalk board, Aluminum Frame, 4'x6', Black Practical and reusable, green and black surface chalk boards are an essential and basic writing surface for the classroom. The satin finished, anodized aluminum frame is heavy-gauge with crimp construction and all four corners precision mitered for extra strength. Every board features a 3/4" frame face width and a full-length chalk rail with protective plastic endcaps for easy access to chalk and eraser. Boards sized 3’ x 4’ and smaller feature Quartet’s patented SureLox hanging system, while larger sized boards feature a heavy-duty L clip installation kit for safe, simple and precise mounting every time.