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The device is a hand-held tool that allows the user to stick the back end, the plunger, onto any surface, and grab onto objects and hold them in the middle of the cabin with the extendable arm (manipulated by the holes at the bottom of the device). The knobs at the top also let astronauts hang whatever other objects they might need while observing what is in the grabber. This device allows the astronauts to use and observe things in the middle of the cabin instead of how usually objects are kept in place only by sticking them to the walls.
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