they have their door hinges exposed on the outside of the safe. Anyone with a decent saw-zaw can cut through the hinge. To negate this, look for Sentry Safe's Professional series. This series has bolts that engage all around the seal of the door; top, bottom, left and right (hinge side). The standard series only has bolts on the left of the door, opposite the hinges. The surprising thing is the professional series doesn't cost any more than the standard series at Home Depot (~$200).
Here's an example of the professional series bolts: http://www.amazon.com/SentrySafe-DS3410-Fire-Safe-1-2-Cubic-...
Here's an example of the standard series bolts:
If you're not looking for one this big, you'd have to hide it well or worry about someone running off with it.
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