We were facing a dilemma. How can we help our customer hang this banner on this outside wall? Oh, by the way, we can’t install any hardware or drill any holes. Ah….. The siding is steel. Bright idea. Jumbo Magnets. Where do you get magnets strong enough to hang a 16′ wide banner. We have them. It worked! Now they can hang banners all over the building whenever they have a need. Let Prographics help with your banners.