The piece is made to print 3" wide, with an arched opening that is 1.5" wide. Four door files are included as well ... a solid single door, a double door, a door with a barred window (such as for a cell), and a full cage door. The wall piece is quite large, as it has a rocky texture on the bricks and archway that add a lot of polygons. This piece is useful for dungeons made with the Open Forge files, Dwarven Forge, Hirst Arts, Dungeonstone, etc., where the pieces are 2" wide on the outside, and corridors are often 3" wide on the inside. This piece allows a gamer to quickly add a doorway in a hallway, or just before a room, etc. There is no base - the piece is intended to sit on top of the other dungeon pieces. I will also be putting out a 3" wide piece that will have a 1" wide doorway soon (along with matching doors).Pieces are made in 3DS Max by scratch. The STL files cleaned up in netfabb.