4mm/1: 76 scale for OO railways or 20 mm wargames.
Brick tunnel portal to span a 48 mm wide gap.
Can be used a s small railway under bridge for road traffic.
Not suitable for running locos or rolling stock under unless narrow guage.
Dimensions. 78 mm L x 4 mm W x 69 mm H. 46 mm H to underside of arch.