Vault Doors with thicker steel sold direct from the manufacturer Sturdy Safe. Commercial quality. Designed to be gun room doors, hidden room doors, walk-in safe rooms, secret room doors, or storm shelter doors. Unbeatable prices for the steel thickness. Easy to install.
Go with the inswing so you can't get locked in......
I have used both. Had delivered to my garage. That Sturdy required 5 of us to get in and down.