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* 5 types of 17mm ball adapters can be used by themselves * Made of engineering rubber, good toughness, not easy to break. * Double ball adapter extension joint connecting bracket for 17mm magnetic car phone holder. * Round magnet head is more stable to fix the phone, double ball head rotation adjustment angle. * Can be installed on car recorder bracket/ car phone holder, etc.mobilephone holder, tablet stand, recorder, GPS navigator-, etc