The custom hanger is made exclusively for our wood maps. Since you put caps in from the front of the metal map, there is no need to take it off of the wall to load it up. Also, the corrugation naturally holds the map away from the wall, creating that cool shadow effect. So you can use the large holes provided in a few locations to screw the map to the wall or hang from picture hooks. The holes are hidden behind caps so you won't see the hardware.
The metal Groove map weighs about 5 lbs without caps.