Sentry Safe Fire-Safe U2101 Stackable File Get organized and protected with this Fire-Safe stackable file drawer. Stacks up to four high if more storage is needed. A new, single-drawer file that features proven fire protection for your most important business or personal documents. In the fire endurance test, product is subjected to fire at temperatures of 1700? F. Tubular key lock for extra security. Full extension drawer glides for ease of use.