O-SCALE TIMBER FRAME SYSTEM features simulated rough cut weathered timbers, antique wrought iron strapping cleats, and hand forged threaded bolts. Ready to use. Cast in highly detailed urethane foam. Classic style for narrow gauge models. Outside dimensions: 8" W x 8" H x 1/2" thick. Inside dimensions: 4-3/8" wide by 6-1/2" high. FL6110-O-Scale Low Post Timber Wall, FL6111-O-Scale High Post Timber Wall, FL6195-O-Scale Timber Frame Portal.