[Universal Fit] Our 17mm ball head adapter is perfectly compatible with all devices featuring a 17mm double socket arm. Ideal for GPS mounts and motorcycle setups, this adapter ensures a versatile and secure fit for your navigational needs. [Robust & Multi-Functional] Constructed from high-quality materials, our adapter offers a long service life. The 17mm ball head is covered with high-quality anti-slip rubber, providing a secure grip and excellent shock absorption, making it a reliable accessory for vehicle or bicycle phone mount systems. [Ergonomic Design & High Compatibility] Featuring a 17mm ball head with a 1/4 inch thread, this adapter connects seamlessly to tripods and camera interfaces. Its ergonomic design ensures a tight connection with phone mounts, maintaining stability even on rugged terrains and at high speeds. [Tool-Free Installation & 360° Adjustment] The phone holder base can be installed and removed quickly without 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 phone clip to create a durable bike or motorcycle phone holder. It's an ideal choice for those who enjoy hands-free operation while exploring the outdoors. Color: Black Material: Plastic + Metal Package Contents: 1 x Mobile phone holder adapter Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement may vary by +/- 1-3 cm.