I've said it here before, but I'll say it again.
A magnetic drillpress with a concrete coring holesaw and a sixpac of beer and a thief will be refreshed and in your safe. Plug in the magnetic drillpress to your wallsocket, turn on the auto-feed, sit back and enjoy a beer. In a few minutes, it'll cut thru a common 1/4" steel safe door and the lock will fall out. Just reach in and push the bolts over and open the door.
Or, a portable $500 plasma cutter running on 120V will cut 3/8" steel plate at 17"/minute.
There's gotta be a lot more to your security plan than a steel door if you have a high investment collection.
