This phone holder for car vent is compatible with car mounts and wireless chargers with a joint ball diameter of 0.67 inches (17mm), fitting all wireless car charger mounts and other air vent mounts on the market (Ensure the ball size matches). Our air vent clips with 3-Point support vent clip offers ultra-secure holding power, providing a more stable grip on vent boards compared to other clips. Drive confidently over bumps and turns without fear of your phone falling. To install our car phone holder vent, unscrew the knob to release the hook and attach it firmly to the air vent blade, then tighten the knob to secure it in place (Note: the vent hook is retractable and rotatable). The vent clips has unique V-shaped hook design with Three grasp points ensures a tight grip on the vent blade, preventing any accidental dislodging. Our air vent car phone mount holder is easy to install and adjust, simply place it on the vent blades and adjust the hook length by turning the knob to match the outlet (360° Rotating hook available).Suitable for Horizontal, Vertical, and Round air outlets, especially compatible with various Mercedes-Benz models. The tough ABS material ball head can support up to 45 pounds (20 kilograms) and is resistant to extreme temperatures from -4°F (-20°C) to 203°F (95°C). Enjoy the convenience and stability of this universal air vent phone holder accessory with buckle technology.