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 927C), 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 1093C furnace for 20 minutes, the unit will not explode or rupture. ETL Verified for 1 hour fire protection of digital media up to 927C 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.