Our laser-scribed and cut Material Bins are perfect for use in rail yards, along sidings, and at supply depots where coal and bulk aggregates such as gravel, stone, and sand are utilized or sold. Each unit is comprised of 3 bins fashioned from quality birch plywood and Peel & Stick assembly with pre-cut basswood posts. Kit includes two units each measuring 4.25 inches long x 1.25 inches deep x 0.75 inches high offering a total of six bins..