The Master Lock LCFW30100 Large Key Locking Chest is waterproof and fire-resistant. It has a sleek design with a flush-mounted faceplate and rugged look. It conforms to various classifications: UL Classified to fire endurance (1 hour at 927°C), to ensure the protection of documents, records and valuables in the event of a fire and to explosion hazard test: Subjected to a flash fire in a 1093°C furnace for 20 minutes, the unit will not explode or rupture. ETL Verified for 1 hour fire protection of digital media up to 927°C in the event of a fire and for water submersion to protect valuable items and documents from flood damage. Specification: Dimensions (HxWxD): External: 19.3 x 41.9 x 37.5cm. Internal: 13.6 x 32.1 x 23.2cm.