Features: This versatile double ball head adapter provides seamless compatibility with navigation mounts, phone holders, and navigation systems, featuring multiple sizes from 9mm to 25mm for universally fitment on various devices. Designed with a double ball head mechanism for 360 degree rotation, this adapter offer four size options—13mm-16mm, 17mm-16mm, 9mm-16mm, and 17mm-25mm—to accommodate different mounting holes, ensuring flexible and secure adjustments for your mobile phone or navigation holder. Ideal for cyclists, motorcyclists, and driver who require a dependable mounting solution, this adapter caters to users needing handfree access to their navigation apps or devices during commutes or outdoor adventures. Perfect for scenarios like car interiors, bike handlebars, or motorcycle dashboards, this ball head adapter enables stable device positioning for real time navigation, making it essential for road trips, daily drives, or outdoor explorations. Crafted from plastic, this robust adapter enhances longevity and reliability, supporting compatibility with popular brands for effortless integration into your existing phone mount or navigation holder setup. Specifications: Component:ABS Size: 13mm-16mm, 17mm-16mm, 9mm-16mm, 17mm-25mm (optional) Package Includes: 2Pcs Double Ball Head Connection Rods note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.