'HOWARD STREET' DOUBLE STONE BLOCK PORTAL. HO-Scale.Overall outside dimension: 7-1/2" W x 4-3/4" H x 1/2" thick. HOWARD STREET MASONRY SYSTEM is an integrated system of matching wall, portals & Scale Masonry Components: FL4158 - "Howard St." Seam Sealers; FL4159 - HO Single Stone Block Portal; FL4260 - HO Double Stone Blck Portal; and FL4190 - HO Stone Blck Retaing Wings.