This is replica or the Fallout Shelter Door Key used by the Terminator named carter to store coltan and keep i safe till judgment day in ep 4:Heavy MetalSarah, John, and Cameron pursue a mysterious shipment of coltan, a key metal needed to construct Terminators.the coltan shipment is being handled by a Terminator, named Carter.His mission is to secure the coltan in a fallout shelter, where it will be available for Skynet after Judgment Day. The shelter will later become a factory for producing Terminators, including Cameron herself.After John is locked in the fallout shelter with Carter, he discovers an idle Terminator will go into standby mode to save power, and he dares to remove a key from around Carter's neck so he can open the door. With Cameron's assistance they ultimately liberate the truckload of coltan from Carter, and Cameron drives it off a cliff into the ocean after locking Carter in the shelter. It is later shown that Cameron kept a bar of coltan for herself.
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