Lots of uses for these.Most obvious (or, actually, hopefully not) is firearm storage. Take the guts out, keep your guns in there. Nobody will ever look. If you're into quick access for defending the home, arrange the top or front so it flips open. If you just need to keep them out of reach of kids and burglars, not much you need to do. Leave the sound plate in and it's not going anywhere, don't even have to bolt it down.