[Universal Fit] our 17mm ball head adapter. Perfectly compatible with all featuring a 17mm double socket arm, this adapter is ideal for GPS mounts and quad-lock motorcycle setups, ensuring a versatile and secure fit for your navigational needs. [Robust & Multi-Functional]Constructed from High-quality materials, our adapter boasts a long service life. The 17mm ball head, covered with high-quality anti-slip rubber, ensures a secure grip and excellent shock absorption, making it an essential accessory for any vehicle or bicycle phone mount system. [Ergonomic Design & High Compatibility]Featuring a 17mm ball head with a 1/4inch thread, this adapter connects seamlessly to tripods and camera interfaces. Its ergonomic design ensures a tight connection with cell phone mounts, maintaining stability even on rugged terrains at high speeds. [Tool-Free Installation & 360° Adjustment]Our cell phone holder base can be installed and removed quickly without any tools. The compact design makes it easy to carry, while the 360° rotatable ball joint allows for easy adjustments, ensuring optimal viewing angles for GPS navigation, music playback, or map checking. [ for Adventurers]Combine this 17mm ball head base with a dual socket arm and cell phone clip to create the ultimate bike or motorcycle cell phone holder. It's an ideal for your loved who enjoy the freedom of hands-free operation while exploring the outdoors.<br><br>Color: Black Material: Plastic+Metal<br><br>Package Contents: 1 x Mobile phone holder adapter<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.