For a little more security, and additional light into your shed, a steel slab door with a 9 lite window pattern is the key. The top half of each door is mostly glass, while the bottom half is solid. Built specifically for use in our sheds, these doors have a wood frame interior and insulation, while the outside is a sturdy steel sheet. The doors are primed, easy to paint, and available in the same sizes as our standard doors. The 9 lite window differs from a transom window in that it is actually one piece of glass, with muntins added to give the appearance of 9 smaller windows (3 rows of 3).