A Fort Knox patent is the corner bolt on the Guardian, Executive, Titan and Legend models. Not only does the corner bolt show very well, it lends to the security of the safe. Would be attackers primarily try to attack the safe through the handle and lock. After failing at those points they turn their attention to the corner of the door. There is extra reinforcement on the corners. There isn’t a better way to truly protect the valuables in the safe, then with the corner bolts on a Fort Knox Safe.