Measuring 20.875" (H) x 18.125" (W) x 18.875" (D), you will have plenty of space to store your most important items and documents. MESA fire safes have all steel construction and come with a UL listed 1 hour fire rating. The door is 4” thick and comes with large locking bolts, and massive 1” diameter locking bolts. The body has an overall thickness of 3.5”, and contains fire resistant material, keeping your valuables protected from fire and extreme heat. It also has a factory tested 2 story impact rating. Enjoy the extra security by using this safe to protect your most important items!