The RF6528 is UL certified with TL-30 burglary protection, meaning it has been rigorously tested to withstand severe attempts at forced entry. It features a massive 6-inch thick door and a 3-1/2 inch thick body, providing a formidable barrier against any intrusion. In addition to its strong burglary defenses, the safe offers 120 minutes of fire protection, ensuring that your items are secure even in the face of extreme conditions.