Features: This 17mm ball head installation expansion adapter features a flexible 360 degree swivels joint and plastic structure, with a builtin metal rod in middle to enhances your devices positioning flexibility, making it suitable for automotive vent dashboards and position installation. The 17mm extension arm provide stability for the device, while its rotating ball end allows for full ranges angle adjustment to overcome the limited visibilities of the dashboards. Very suitable for car owners, driver, and outdoor enthusiasts who need reliable installation solution for navigation devices, mobile phones, or tablets. Perfectly locate devices to achieve clear road visibilities during location navigation, handfree streaming in car, or workspaces organization on trucks. With its easy installation system, it is easy to achieve the best viewing angle by simply connecting the 17mm socket end to a compatible ventilation/dashboards mounting brackets and securing your devices brackets. Specifications: Material: Plastic + Metal Length:Approx.205mm/8inches Package Includes: 1Piece 17mm Ball Mount Extension note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.