Fireproof Your Belongings If you have important documents, jewelry or heirlooms, then a fireproof file cabinet is an essential item. The file cabinet is built with an insulated steel construction and durable powder coated finish. It has been UL one-hour fire and impact tested. Locking drawers operate on full-extension ball bearing slides. Insulation between drawers makes each drawer a separate, fireproof unit. Choose between two discrete colors-black or parchment-to fit your home or office decor.