Thick 41⁄4” door with recessed anti-pry design. Safe walls are 21⁄2” thick.Five active bolts that lock in 3 directions, massive 1” diameter round bolts that extend deep into safes body (Models 1812-3018). Center bolt down hole for easy installation (hardware included). Plush suede like quality interior to protect jewelry and valuables. UL listed Group II high security lock, mechanical or electronic available. UL 2-hour fire label, furnace-tested to 1850°F for 2 hours. Interior temperature of safe was less than 350°F during the test and cool down. Models 1812 – 3018 now with U.L. RSC (burglary) label. Solid chrome-plated handle with shear point to prevent the safe from being forced open by handle attack. Independent re-locker and hardplate to prevent drilling attack on locking mechanism.