Half of a large hold-down stud frangible nut, measuring 2.75 x 5.75 x 4, applied to a wooden 11.75 x 9 plaque attributing it to the STS-107 launch on January 16, 2003. The heavy piece weighs an overall 10.2 pounds. In fine condition. Prior to Space Shuttle launches, frangible nuts were placed at the top of the four long bolts that secured each SRB to the Mobile Launch Platform. At the instant of launch, two embedded detonators broke each nut into two halves, allowing the release of the craft from the platform.
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