Keys can be used to make arrowheads
We’ve already explained here that there is a way to build a crossbow using everyday items, such as a bike tire. However, it’s important to know how to make arrows, too. Historically, fletchers fashioned them from a strip of wood and a sharp metallic head called a broadhead.
If an arrowhead is needed to hunt in an emergency, it can be made from some keys. Just attach three keys to each other (here’s where that super glue in the survival kit is useful again) and sharpen their points to make a DIY broadhead.