The Gardall WMS912-G-E is a fireproof safe with a 2" flange. This flange goes around the outside of the safe and helps finish the wall safe install. This safe is not designed to be bolted to the studs like traditional . The flange is bolted to the safe. Because of the heavy weight, a platform needs to be built behind the wall underneath this safe. The WMS912-G-E is then bolted to the platform using an anchor bolt through the anchor hole in the middle of the safe. If you need more information on how this flange works, please  to view the installation instructions.