Hollon Fire and Burglary Safes: : Offer top of the line fireproof protection and steel. The two hour fire rating with an overall 5.5 inch thick door with over 2.5 inch wall defense barrier. Comes with a high security glass relocker system. 2-Hour Class 350 Fire Tested that protects against intense temperatures over 1700 degrees. Plus this model is impact rated for a 30 foot drop. Simulating a fall from a third story house when the building burns down. The KS4500 Class 350 2-hour fire rating means that the internal temperature of the safe will not exceed 350 degrees for at least two hours when exposed to these flames. Which is perfect for all types of paperwork, coins, jewelry, and cash.