ring

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During five spacewalks, astronauts plan to install two new cameras, repair two broken instruments, replace all six positioning gyroscopes and batteries, shore up the telescope's thermal insulation and attach a docking ring so that Hubble can be removed from orbit upon completion of its mission.
The FireWire hub surpasses conventional hubs by allowing you to connect other Belkin FireWire devices, including additional hubs, hard disk drives and other devices using its unique docking ring feature.
Once the vehicles' docking rings had made a good capture, 12 hooks were deployed to fix the craft in place.