So what makes the MJ-1814 a high security safe? Let's start with the door consisting of a 1/4" armor plate steel, then add in varying thicknesses of 10, 8 and 3 gauge steel combined with aluminum concrete mixture in between another slab of hardened steel. Add in the hard plate and re-lockers and it's easy to see how this safe can survive a sophisticated attack for 30 minutes. As if that's not enough, the MJ-1814 also offers the maximum protection against high-intensity fires. With a 2 hour factory tested rating, this safe maintained an internal temperature below 350° for 2 hours with an external temperature reaching up to 1750°! So I'm guessing you're wondering how they did it? Well with features like a special design burglary resistant handle, glass re-locker and a highly compressed proprietary concrete mixture, the MJ-1814 is a TANK! Standard on the MJ-1814 high security safe a UL Listed S&G Spyproof Group 2M Mechanical Dial lock with the ability to upgrade to the S&G Spartan D-Drive Electronic Lock.