Features: OOTDTY Brand new and high quality 5 kinds of power adapters; 17mm balls can be used alone made of technical rubber, good toughness, not easy to break. break. Adapter Extension Joint Connection Bracket double ball for 17mm magnetic car phone holder. Round magnet for the head is more stable to fix the phone, double ball for adjustment angle rotation of the head. Can be installed on the car recorder holder / car phone holder, etc. mobile phone holder, tablet holder, recorder, GPS-navigator, etc. Specifications: Material: Rubber + plastic Ball head: approx. 17mm/0.67" Name: Suitable MobilePhone Car Holder at connector 17mm Ball diameter: 17mm Types:5 types optional Top joint Specifications: Two joints at 17mm same size ball joint Interface: 17mm ball head Package includes 1x Ball Joint Extension Joint Note: Please allow 0 error to 1cm due to manual measurement. Please make sure you do not mind before ordering. Due to the difference between different monitors, the picture may not reflect the actual color of the item . Thanks to; you