The plinth molding is 15” tall and is perfect as a surround on the base of a classical structure. It comes in 4 dimensions: 12” wide, 18” wide, 24” wide and the stretcher is 36” long. The first 3 can be used as bases around pillars and also on corners. The installer needs to give these molding a trim at a 45 degree angle. A supporting “L” shaped galvanized metal below helps with the installation.