This 1" maprail flag holder is made for Ghent's 1" maprails. About Ghent's 1" Maprails (sold separately): The perfect tack surface when space is limited. Ghent's 1" maprails feature a durable aluminum rail with a self-healing Cork posting strip. Mounts easily to the top of a board or directly to a wall. When added to a chalk or markerboard, these display rails provide an organized way to hang flags, teachers aids or charts with optional accessories.