I made a 50" long flower box using 6" by 1" redwood. It will be mounted below a 2nd story window. I'm writing to ask members if one piece of 1/8 thick by 3/4" wide flat steel on each end bent 90* and attached so vertical section is behind box will support 60 pounds. That weight is an estimate of the box full of dirt and is most likely higher than its actual total weight.