You can use a metal cutting wheel or a hacksaw, but I would be careful about cutting zinc-plated steel, if you inhale too much zinc you could get metal fume fever, you might want to wear a painting respirator, especially if you ever do a lot of cutting of zinc-plated metal. The other poster gave some good tips but I just wanted to be sure that you were aware of the risks of cutting objects containing zinc. Also Home Depot has been known to cut wood for people but Menards doesn't, they usually just sell more sizes instead of having a saw on site like home depot. But I only know that they cut wood, I never asked if they could cut metal, so they might or they might not. Also the fact that it's zinc coated steel might mean they can't because of some safety law, but I'm not sure about that either.