HO-SCALE CONCRETE RETAINING WINGS - For recessed cut mountain portals. A perfect match for both single & double concrete systems. Dimensions: 5-1/4" W x 4" H x 1/4" thick. ORNATE CONCRETE SYSTEM is an integrated system of matching wall, portals & Scale Masonry components: FL4165-HO single ornate concrete portal; FL4266-HO double ornate concrete portal; FL4200-HO Concrete Retaining Wing Set.