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-Special fireproof stuffing material(cellular concrete)
-Strong locking mechanism and locking bolts
-Heavy duty vault style door and hinges
-Inside dead locking bolts secure the door firming
-Ensuring to the inner temperature less than 160℃，while exposed in 1010℃ flame for 1 hour
-UL approval
-2 sets of in dependently 4-8 digitals setting-up system; user code and management code
-3 in correct entries auto-locking function
-2 pcs manual override key included
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