Ever wonder what to do with old metal keys you no longer need? The good news is that they are recyclable, since most household keys are comprised of brass with a nickel coating. All you have to do is remove any plastic covers you might have on the key and bring it to scrap metal or recycling facilities. Old keys are melted down to make new metal products. Here’s another idea: Have a key fundraising drive. Ask everyone to bring old keys from their junk drawer, and sell the whole lot to a scrap metal dealer. Local businesses like car dealers and realtors could donate tons of keys to help you raise money, too.